todosrht: Fix 405 error when clicking 'next' in ticket list

When using the ticket preview feature, the URL would previously change
to /~user/tracker/submit. Attempting to navigate to the next page of
tickets afterwards would cause a 405 error since
/~user/tracker/submit?page=N is an invalid link.

Fix by changing the ticket submit route to /~user/tracker, so that
adding ?page=N results in a valid link.

todosrht/blueprints/tracker.py

@@ -181,7 +181,7 @@ def disable_notifications(owner, name):
     db.session.commit()
     return redirect(tracker_url(tracker))
 
-@tracker.route("/<owner>/<name>/submit", methods=["POST"])
+@tracker.route("/<owner>/<name>", methods=["POST"])
 @loginrequired
 def tracker_submit_POST(owner, name):
     tracker, access = get_tracker(owner, name, True)