Fixed #12612 -- Corrected handling of parameter formatting in SQLite backend...

Fixed #12612 -- Corrected handling of parameter formatting in SQLite backend so that executemany raises exceptions when bad parameter counts are provided. Thanks to Niels <niels@pythonheads.nl> for the report, and Gabriel Hurley for the help narrowing down the problem.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12836 bcc190cf-cafb-0310-a4f2-bffc1f526a37