Inner class MaskKeysym in MenuItem can be static

Doen with JDT clean-up.

Change-Id: Ie3f9ef4686aa97c6cadbb2468cc32fb52b0ccd1f
Signed-off-by: Lars Vogel <[email protected]>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.swt/+/186594
Tested-by: Platform Bot <[email protected]>

Author: vogella

bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/MenuItem.java

@@ -1372,7 +1372,7 @@ void updateAccelerator (long accelGroup, boolean add) {
 	}
 }
 
-private class MaskKeysym {
+private static class MaskKeysym {
 	int mask = 0;
 	int keysym = 0;
 }