Replace deprecated method call in Java7 FTI test

Change-Id: I3bbb6da951765d79d77aa955edeac7b5e4da5d8a

org.eclipse.jgit.java7.test/src/org/eclipse/jgit/treewalk/FileTreeIteratorJava7Test.java

@@ -152,7 +152,8 @@ public class FileTreeIteratorJava7Test extends RepositoryTestCase {
 		assertEquals("link", dci.getEntryPathString());
 
 		// test
-		assertFalse(fti.isModified(dci.getDirCacheEntry(), true));
+		assertFalse(fti.isModified(dci.getDirCacheEntry(), true,
+				db.newObjectReader()));
 	}
 
 	/**