Mark changes new if a patchset has been added to them

This moves the change out of the SUBMITTED state, as it must
once again be reviewed now that a new patch set has been put
into it.

Signed-off-by: Shawn O. Pearce <sop@google.com>

appjar/src/main/java/com/google/gerrit/server/ssh/Receive.java

@@ -542,6 +542,7 @@ class Receive extends AbstractGitCommand {
       }
     }
 
+    change.setStatus(Change.Status.NEW);
     change.setCurrentPatchSet(imp.getPatchSetInfo());
     change.updated();
     db.changes().update(Collections.singleton(change));