Revert "Fossil: fix detection of deleted lines"
Revert "Fossil: fix detection of deleted lines"

This reverts commit 6ab96c13937754e3078076c7fb6996a404f04459.

Unfortunately the situation is a tad more complicated than I thought. Revert for
now and have an eye on https://fossil-scm.org/forum/forumpost/834ce0f1e1

mhinz/vim-signify