[CSS] ClassCastException in CssStyleHelper calculateValue

This issue can be reproduce always by executing TableViewMouseInputTest using the following command:

```
/bin/sh gradlew -PSTUB_RUNTIME=../caches/modular-sdk -PFULL_TEST=true -PUSE_ROBOT=true --no-daemon --info --stacktrace cleanTest :controls:test --tests TableViewMouseInputTest -x :web:test --stacktrace 2>&1 | tee ~/`date +"test-%Y-%m%d-%H%M%S"`.log
```

output:
TableViewMouseInputTest > test_rt21444_down_row STANDARD_ERROR
    Aug 02, 2022 11:06:00 AM javafx.scene.CssStyleHelper calculateValue
    WARNING: Caught 'java.lang.ClassCastException: class java.lang.String cannot be cast to class javafx.scene.paint.Paint (java.lang.String is in module java.base of loader 'bootstrap'; javafx.scene.paint.Paint is in module javafx.graphics@20-internal of loader 'app')' while converting value for '-fx-background-color' from rule '*.table-row-cell' in stylesheet file:/Users/angorya/Projects/jfx/build/shims/javafx.controls/com/sun/javafx/scene/control/skin/modena/modena.bss
    Aug 02, 2022 11:06:00 AM javafx.scene.CssStyleHelper calculateValue
    WARNING: Caught 'java.lang.ClassCastException: class java.lang.String cannot be cast to class javafx.scene.paint.Paint (java.lang.String is in module java.base of loader 'bootstrap'; javafx.scene.paint.Paint is in module javafx.graphics@20-internal of loader 'app')' while converting value for '-fx-border-color' from rule '*.table-cell' in stylesheet file:/Users/angorya/Projects/jfx/build/shims/javafx.controls/com/sun/javafx/scene/control/skin/modena/modena.bss


I have seen similar messages when running a javafx application in the field. Also, similar issue was reported in stackoverflow:
https://stackoverflow.com/questions/27311222/javafx-getting-class-cast-exception-in-css-for-blend-mode

Also, see JDK-8088468

----------------------------------------------------

Minimal reproducable example:
### START ###
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class CssWarningBug extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage stage) {
        Scene scene = new Scene(new StackPane(buildTableView()));
        stage.setScene(scene);

        stage.show();
    }

    private TableView<String> buildTableView() {
        TableView<String> tableView = new TableView<>();

        TableColumn<String, String> column = new TableColumn<>("column");
        column.setCellValueFactory(param -> new SimpleStringProperty(param.getValue()));
        column.setCellFactory(param -> new ScenePropertyTableCell<>());

        tableView.getColumns().add(column);
        tableView.getItems().addAll("item1", "item2", "item3");

        return tableView;
    }

    private static class ScenePropertyTableCell<S> extends TableCell<S, String> {
        public ScenePropertyTableCell() {
            sceneProperty().addListener((obs, oldScene, newScene) -> {
                if (newScene == null || newScene.getRoot().getProperties().containsKey("new.root")) {
                    return;
                }

                StackPane newRoot = new StackPane();
                newRoot.getProperties().put("new.root", true);
                Parent oldRoot = newScene.getRoot();

                newScene.setRoot(newRoot);

                // CLASS CAST EXCEPTION
                // If this call is before newScene.setRoot(newRoot);, nothing will happen.
                // Maybe because -fx-table-cell-border-color is not yet parsed because we changed the root?
                newRoot.getChildren().setAll(oldRoot);
            });
        }
    }
}
### END ###