delete trailing whitespace

Author: anass-baya

test/jdk/java/awt/Frame/BogusFocusableWindowState/BogusFocusableWindowState.java

@@ -26,7 +26,7 @@
 /**
  * @test
  * @bug 8346952
- * @summary Verifies no exception occurs when triggering updateCG() 
+ * @summary Verifies no exception occurs when triggering updateCG()
  * for an ownerless window.
  * @key headful
  */