Fix binary uuid casting

[greg-rychlewski]

I think this solves your issue here: #119

I'm not too familiar with SQLite but from what I can tell from the tests it doesn't like it when cast(_ as blob) is used. It seems to work when the casting is removed.

[warmwaffles]

Thank you for doing this. I'll need to chuck a test or two into the ecto/adapters/sqlite3/connection directory that check the select statements but this solves the immediate problem.