rc git: Highlight commands differently from `pick`
rc git: Highlight commands differently from `pick`

The `pick` command in a rebase commit is virtually a no-op, but other
commands actually do things. This commit visually communicates
that fact.

Fixes #3208.

alexherbo2/kakoune,occivink/kakoune,mawww/kakoune,alexherbo2/kakoune,casimir/kakoune,mawww/kakoune,lenormf/kakoune,danr/kakoune,Somasis/kakoune,danr/kakoune,danr/kakoune,Somasis/kakoune,occivink/kakoune,occivink/kakoune,lenormf/kakoune,lenormf/kakoune,occivink/kakoune,casimir/kakoune,casimir/kakoune,alexherbo2/kakoune,alexherbo2/kakoune,casimir/kakoune,jkonecny12/kakoune,Somasis/kakoune,mawww/kakoune,jkonecny12/kakoune,Somasis/kakoune,mawww/kakoune,jkonecny12/kakoune,lenormf/kakoune,danr/kakoune,jkonecny12/kakoune