pullbundles: use unfiltered repo for head/base matching
The unfiltered view works even when changeset transistion from draft to
hidden phase. The normal visibility is already ensured by discovery as
invisible heads would have been filtered out before. Skipping the
filtering has a positive impact on performance, too.
Differential Revision: https://phab.mercurial-scm.org/D8481
Our full contribution guidelines are in our wiki, please see:
https://www.mercurial-scm.org/wiki/ContributingChanges
If you just want a checklist to follow, you can go straight to
https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
If you can't run the entire testsuite for some reason (it can be
difficult on Windows), please at least run `contrib/check-code.py` on
any files you've modified and run `python contrib/check-commit` on any
commits you've made (for example, `python contrib/check-commit
273ce12ad8f1` will report some style violations on a very old commit).