remove unused import in test

diff --git a/modules/javafx.controls/src/test/java/test/javafx/scene/control/TreeTableViewTest.java b/modules/javafx.controls/src/test/java/test/javafx/scene/control/TreeTableViewTest.java
--- a/modules/javafx.controls/src/test/java/test/javafx/scene/control/TreeTableViewTest.java
+++ b/modules/javafx.controls/src/test/java/test/javafx/scene/control/TreeTableViewTest.java
@@ -26,7 +26,6 @@
 package test.javafx.scene.control;
 
The following unused import is causing problems when compiling with modules.

 import com.sun.javafx.scene.control.TableColumnBaseHelper;
-import static com.sun.xml.internal.fastinfoset.alphabet.BuiltInRestrictedAlphabets.table;
 import static test.com.sun.javafx.scene.control.infrastructure.ControlTestUtils.assertStyleClassContains;
 import static javafx.scene.control.TreeTableColumn.SortType.ASCENDING;
 import static javafx.scene.control.TreeTableColumn.SortType.DESCENDING;