after approving an alias, immediately set the old tag's post count to zero, so it's known to not be in use
after approving an alias, immediately set the old tag's post count to zero, so it's known to not be in use

--HG--
branch : moe
extra : convert_revision : svn%3A2d28d66d-8d94-df11-8c86-00306ef368cb/trunk/moe%40983

moebooru/moebooru,moebooru/moebooru,moebooru/moebooru,nanaya/moebooru,nanaya/moebooru,euank/moebooru-thin,nanaya/moebooru,euank/moebooru-thin,euank/moebooru-thin,nanaya/moebooru,moebooru/moebooru,euank/moebooru-thin,euank/moebooru-thin,nanaya/moebooru,moebooru/moebooru