Fix deprecated WTI#isModified

We should really pass the forceContentCheck parameter to
the real method.

Change-Id: I9ea439cf6340a18d0e931edde3b9e3486cafde93
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java

@@ -801,7 +801,7 @@ public abstract class WorkingTreeIterator extends AbstractTreeIterator {
 	 * @deprecated Use {@link #isModified(DirCacheEntry, boolean, ObjectReader)}
 	 */
 	public boolean isModified(DirCacheEntry entry, boolean forceContentCheck) {
-		return isModified(entry, false, null);
+		return isModified(entry, forceContentCheck, null);
 	}
 
 	/**