Remove fake comment from gitmessage

This was part of a botched copy paste and should not be in the actual
gitmessage, since the real change list will come from git itself.

profiles/base-user/.config/git/gitmessage.nix

@@ -20,13 +20,4 @@ in
   #
   Co-authored-by: ${user.fullName} <${user.email}>
 
-# Please enter the commit message for your changes. Lines starting
-# with '#' will be ignored, and an empty message aborts the commit.
-#
-# On branch master
-# Your branch is up to date with 'origin/main'.
-#
-# Changes to be committed:
-#       new file:   installation.md
-#
 ''