Replace git with 'command git' (#1551)

to improve performance if git is aliased to hub or other wrappers.

modules/git/functions/git-stash-dropped

@@ -7,15 +7,15 @@
 
 # function git-stash-dropped {
 
-if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
   print "$0: not a repository work tree: $PWD" >&2
   return 1
 fi
 
-git fsck --unreachable 2> /dev/null \
+command git fsck --unreachable 2> /dev/null \
   | grep 'commit' \
   | awk '{print $3}' \
-  | git log \
+  | command git log \
       --pretty=format:${_git_log_oneline_format} \
       --extended-regexp \
       --grep="${1:-(WIP )?[Oo]n [^:]+:}" \