SQL: Don't DROP the temporary edit_* tables
SQL: Don't DROP the temporary edit_* tables

Simply re-using them by truncating the tables first is faster, and
requires less locking when performing batch edits in one transaction.

erengy/vndb,christian-roggia/vndb,morkt/vndb,erengy/vndb,morkt/vndb,erengy/vndb,christian-roggia/vndb,christian-roggia/vndb,morkt/vndb,morkt/vndb,morkt/vndb