Re-enable FXML tests after broken tests are fixed

The following tests cause test errors:

    [junit] Testsuite: javafx.fxml.RT_21559Test
    [junit] Tests run: 1, Failures: 0, Errors: 1, Time elapsed: 0.156 sec
    [junit]
    [junit] Testcase: initializationError(javafx.fxml.RT_21559Test): Caused an ERROR
    [junit] No runnable methods
    [junit] java.lang.Exception: No runnable methods
    [junit] at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    [junit]
    [junit]
    [junit] Test javafx.fxml.RT_21559Test FAILED
    [junit] Testsuite: javafx.fxml.RT_22864Test
    [junit] Tests run: 1, Failures: 0, Errors: 1, Time elapsed: 0.157 sec
    [junit]
    [junit] Testcase: initializationError(javafx.fxml.RT_22864Test): Caused an ERROR
    [junit] No runnable methods
    [junit] java.lang.Exception: No runnable methods
    [junit] at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    [junit]
    [junit]
    [junit] Test javafx.fxml.RT_22864Test FAILED
    [junit] Testsuite: javafx.fxml.RT_22971Test
    [junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 0.266 sec

I have disabled them for now. This bug is filed to re-enable the tests after verifying that "ant test" passes.