Fix sql style and add backticks... thanks @Kondou-ger
Fix sql style and add backticks... thanks @Kondou-ger

Ref owncloud/apps#912

owncloud/bookmarks,owncloud/bookmarks,shtrom/bookmarks,shtrom/bookmarks,behrisch/bookmarks,alberanid/bookmarks,behrisch/bookmarks,tflidd/bookmarks,alberanid/bookmarks,tflidd/bookmarks