wt-status: allow "ahead " to be picked up by l10n

The extra pair of parentheses keeps the l10n engine from picking up the
string. Remove them so that "ahead " ends up in git.pot.

Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

wt-status.c

@@ -1492,10 +1492,10 @@ static void wt_shortstatus_print_tracking(struct wt_status *s)
 		color_fprintf(s->fp, header_color, LABEL(N_("behind ")));
 		color_fprintf(s->fp, branch_color_remote, "%d", num_theirs);
 	} else if (!num_theirs) {
-		color_fprintf(s->fp, header_color, LABEL(N_(("ahead "))));
+		color_fprintf(s->fp, header_color, LABEL(N_("ahead ")));
 		color_fprintf(s->fp, branch_color_local, "%d", num_ours);
 	} else {
-		color_fprintf(s->fp, header_color, LABEL(N_(("ahead "))));
+		color_fprintf(s->fp, header_color, LABEL(N_("ahead ")));
 		color_fprintf(s->fp, branch_color_local, "%d", num_ours);
 		color_fprintf(s->fp, header_color, ", %s", LABEL(N_("behind ")));
 		color_fprintf(s->fp, branch_color_remote, "%d", num_theirs);