Fix tests broken by fix for adding files in a network share

The change Ie0350e032a97e0d09626d6143c5c692873a5f6a2 was not
done properly. The renamed file was not write protected, and
this broke a test.

Bug: 335388
Change-Id: I41b2235b7677bc5fddc70dda2a56cdd2cb53ce5d
Signed-off-by: Robin Rosenberg <robin.rosenberg@dewire.com>

org.eclipse.jgit/src/org/eclipse/jgit/storage/file/ObjectDirectory.java

@@ -482,7 +482,7 @@ public class ObjectDirectory extends FileObjectDatabase {
 			return InsertLooseObjectResult.EXISTS_LOOSE;
 		}
 		if (tmp.renameTo(dst)) {
-			tmp.setReadOnly();
+			dst.setReadOnly();
 			unpackedObjectCache.add(id);
 			return InsertLooseObjectResult.INSERTED;
 		}
@@ -493,6 +493,7 @@ public class ObjectDirectory extends FileObjectDatabase {
 		//
 		dst.getParentFile().mkdir();
 		if (tmp.renameTo(dst)) {
+			dst.setReadOnly();
 			unpackedObjectCache.add(id);
 			return InsertLooseObjectResult.INSERTED;
 		}