Remove `use_c10_dispatcher: full` lines (#49259)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49259
Since `use_c10_dispatcher: full` is now the default, we can remove all those pesky lines mentioning it. Only the `use_c10_dispatcher: hacky_wrapper_for_legacy_signatures` lines are left.
ghstack-source-id: 119450485
Test Plan: waitforsandcastle
Reviewed By: ezyang
Differential Revision: D25506526
fbshipit-source-id: 8053618120c0b52ff7c73cacb34bec7eb38f8fe0
