Fixed indentation in record

[fonnesbeck]

Found this indentation issue in the SQLite backend; can add it to next RC if one is required, otherwise can wait for merge post-3.0.

[springcoil]

I think it's fine to merge this into the current release candidate as it's a useful bug fix but not a major change.

[kyleam]

@fonnesbeck Was this in response to a bug you observed in the sqlite
output?

_execute_queue loops over self.varnames, so I don't think it was
intended to be called in the inner loop. varname from the loop is
just used to get the current length of the queue (i.e., it could be
any member of self.varnames). Stylistically, it would probably be
clearer to use self.varnames[0].

[fonnesbeck]

@kyleam no, I noticed it while linting. That makes sense, though. I can revert and use the self.varnames[0] syntax you suggest.