add--interactive.perl: use add--helper --show-help for help_cmd

Change help_cmd sub in git-add--interactive.perl to use
show-help command from builtin add--helper.

Signed-off-by: Slavica Djukic <[email protected]>

Author: slavicaDj

git-add--interactive.perl

@@ -1717,16 +1717,7 @@ sub quit_cmd {
 }
 
 sub help_cmd {
-# TRANSLATORS: please do not translate the command names
-# 'status', 'update', 'revert', etc.
-	print colored $help_color, __ <<'EOF' ;
-status        - show paths with changes
-update        - add working tree state to the staged set of changes
-revert        - revert staged set of changes back to the HEAD version
-patch         - pick hunks and update selectively
-diff          - view diff between HEAD and index
-add untracked - add contents of untracked files to the staged set of changes
-EOF
+	system(qw(git add--helper --show-help));
 }
 
 sub process_args {