Reset git-desired-protocol to use git by default.

It got flipped to https for a change related to anongit.kde.org but that
looks like a mistake as this setting only works on push (not fetch) URLs.
2 jobs for fix-gitlab-migration in 2 minutes and 31 seconds (queued for 14 minutes and 7 seconds)
latest
Status Job ID Name Coverage
  Test
passed #46544
smoke-test

00:01:53

passed #46543
unit-test

00:00:37