[git] fix 'ggL' alias typo

Credit to @toogley for discovering the typo here:
https://github.com/sorin-ionescu/prezto/pull/1157

Since zim and prezto share the same git aliases, it is applicable here
as well.

modules/git/init.zsh

@@ -77,7 +77,7 @@ alias gfu='git remote update -p; git merge --ff-only @\{u\}'
 alias gg='git grep'
 alias ggi='git grep --ignore-case'
 alias ggl='git grep --files-with-matches'
-alias ggL='git grep --files-without-matches'
+alias ggL='git grep --files-without-match'
 alias ggv='git grep --invert-match'
 alias ggw='git grep --word-regexp'