roll should use boolean :upvoted_roll

[spinosa]

this will override title and thumbnail_url instead of manually checking against the rolls creator

• when created in ensure_user_special_rolls set this to true
• roll.title and roll.thumbnail_url should check for upvoted_roll and return different data in that case
• need to update tests to check for this stuff
• need to fix all the upvoted rolls already in the DB