Fixes compiler warning in ThemeEngine for unused variable

Change-Id: I6f9b7e2c97c717047ca2ad633c040cb5f0b221c6
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>
diff --git a/bundles/org.eclipse.e4.ui.css.swt.theme/src/org/eclipse/e4/ui/css/swt/internal/theme/ThemeEngine.java b/bundles/org.eclipse.e4.ui.css.swt.theme/src/org/eclipse/e4/ui/css/swt/internal/theme/ThemeEngine.java
index de84cfc..75c3b3c 100644
--- a/bundles/org.eclipse.e4.ui.css.swt.theme/src/org/eclipse/e4/ui/css/swt/internal/theme/ThemeEngine.java
+++ b/bundles/org.eclipse.e4.ui.css.swt.theme/src/org/eclipse/e4/ui/css/swt/internal/theme/ThemeEngine.java
@@ -110,7 +110,6 @@
 
 		File[] modifiedFiles = modDir.listFiles();
 		String currentOS = Platform.getOS();
-		String currentWS = Platform.getWS();
 		boolean e4_dark_mac_found = false;
 
 		for (IExtension e : extPoint.getExtensions()) {