The mistake was made when flags were moved to the database. The `notify_moderators` (something else) flag should be the last position on the list.
This commit contains 3 changes:
- update fixtures order;
- remove position and enable from fixtures (they can be overridden by admin and we don't want seed to restore them);
- migration to fix data if the order was not changed by admin.
Continued work on moderate flags UI.
In this PR admins are allowed to change the order of flags. The notify user flag is always on top but all other flags can be moved.
