format fix

Author: ddamke

src/main/java/de/doubleslash/keeptime/viewpopup/GlobalScreenListener.java

@@ -24,7 +24,6 @@
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
-import de.doubleslash.keeptime.common.OS;
 import org.jnativehook.GlobalScreen;
 import org.jnativehook.NativeHookException;
 import org.jnativehook.keyboard.NativeKeyEvent;