ui-shared: use show_date for footer timestamp

Signed-off-by: John Keeping <john@keeping.me.uk>

ui-shared.c

@@ -801,7 +801,7 @@ void cgit_print_docend(void)
 	else {
 		htmlf("<div class='footer'>generated by <a href='http://git.zx2c4.com/cgit/about/'>cgit %s</a> at ",
 			cgit_version);
-		cgit_print_date(time(NULL), FMT_LONGDATE, ctx.cfg.local_time);
+		html_txt(show_date(time(NULL), 0, cgit_date_mode(FMT_LONGDATE)));
 		html("</div>\n");
 	}
 	html("</div> <!-- id=cgit -->\n");