Remove "Classpath" exception from java/awt tests

The test files should not contain the "Classpath" exception in the copyright header.

Yet there are 29 files in test/jdk/java/awt which do:

Component/CompEventOnHiddenComponent/CompEventOnHiddenComponent.java
Focus/ModalDialogActivationTest/ModalDialogActivationTest.java
MenuBar/DefaultMenuBarDispose.java
MenuBar/TestNoScreenMenuBar.java
Window/FullWindowContentTest/FullWindowContentTest.java
Window/GetWindowsTest/GetWindowsTest.java
Window/HandleWindowDestroyTest/HandleWindowDestroyTest.java
Window/MainKeyWindowTest/libTestMainKeyWindow.m
Window/MainKeyWindowTest/TestMainKeyWindow.java
datatransfer/Clipboard/BasicClipboardTest.java
datatransfer/Clipboard/GetContentsInterruptedTest.java
datatransfer/ImageTransfer/ImageTransferTest.java
datatransfer/Independence/IndependenceAWTTest.java
datatransfer/Independence/IndependenceSwingTest.java
datatransfer/SystemFlavorMap/AddFlavorForNativeTest.java
datatransfer/SystemFlavorMap/AddFlavorTest.java
datatransfer/SystemFlavorMap/AddNativeForFlavorTest.java
datatransfer/SystemFlavorMap/AddNativeTest.java
datatransfer/SystemFlavorMap/GetFlavorsForNewNativeTest.java
datatransfer/SystemFlavorMap/GetNativesForNewFlavorTest.java
datatransfer/SystemFlavorMap/InvalidMapArgumentsTest.java
datatransfer/SystemFlavorMap/ManyFlavorMapTest.java
datatransfer/SystemFlavorMap/SetDataFlavorsTest.java
datatransfer/SystemFlavorMap/SetFlavorsForNativeTest.java
datatransfer/SystemFlavorMap/SetNativesForFlavor.java
datatransfer/SystemFlavorMap/SetNativesTest.java
datatransfer/SystemSelection/SystemSelectionAWTTest.java
datatransfer/SystemSelection/SystemSelectionSwingTest.java
event/ComponentEvent/MovedResizedTwiceTest/MovedResizedTwiceTest.java


This list is obtained by running
grep -R -l '"Classpath" exception' *
in test/jdk/java/awt.