Correct path for core_extensions.
Correct path for core_extensions.

--HG--
extra : rebase_source : 051996b155b97847083a0d572b630778cff3b3a1

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