test: use generaldelta in 'test-patchbomb.t' Using generaldelta changes the default type of bombed bundle.

test: use generaldelta for test-bundle.t This impacts tests of the 'packed' feature. We can safely accept the new output because the 'v1' format is not restricted to old revlog format, the requirements are properly advertised to the client.

test: use generaldelta in 'test-rebase-conflict.t' Doing this has some minor impacts on test output since the rebase backup bundle moves to bundle2.