fixed unique columns method in Peer classes when several unique indexes exist for the same column
fixed unique columns method in Peer classes when several unique indexes exist for the same column

git-svn-id: fc41359fba733ec4de536842de046a3db7e47f88@9665 ee427ae8-e902-0410-961c-c3ed070cd9f9

Symfony-Plugins/sfPropel14Plugin