Removed duplicated sqlite3 converter.
Removed duplicated sqlite3 converter.

Converters typenames are case-insensitive. See
https://docs.python.org/3/library/sqlite3.html#sqlite3.register_converter.
apollo13/django,solarissmoke/django,felixxm/django,pauloxnet/django,atul-bhouraskar/django,auvipy/django,wkschwartz/django,adamchainz/django,freakboy3742/django,solarissmoke/django,dsanders11/django,manhhomienbienthuy/django,koordinates/django,atul-bhouraskar/django,adamchainz/django,apollo13/django,monetate/django,ghickman/django,ghickman/django,rsalmaso/django,blighj/django,django/django,elena/django,elena/django,googleinterns/django,dsanders11/django,rsalmaso/django,freakboy3742/django,felixxm/django,MarkusH/django,pauloxnet/django,takis/django,ghickman/django,wkschwartz/django,pauloxnet/django,manhhomienbienthuy/django,dsanders11/django,wkschwartz/django,blighj/django,koordinates/django,apollo13/django,rsalmaso/django,django/django,adamchainz/django,monetate/django,solarissmoke/django,monetate/django,felixxm/django,manhhomienbienthuy/django,dsanders11/django,monetate/django,elena/django,django/django,shaib/django,shaib/django,atul-bhouraskar/django,shaib/django,solarissmoke/django,adamchainz/django,takis/django,freakboy3742/django,manhhomienbienthuy/django,auvipy/django,MarkusH/django,takis/django,googleinterns/django,auvipy/django,auvipy/django,django/django,apollo13/django,koordinates/django,MarkusH/django,wkschwartz/django,shaib/django,elena/django,googleinterns/django,koordinates/django,blighj/django,blighj/django,googleinterns/django,atul-bhouraskar/django,felixxm/django,ghickman/django,MarkusH/django,takis/django,rsalmaso/django,pauloxnet/django