gitweb: Escape ESCAPE (\e) character

Take a look at commit 20a3847d8a
using gitweb before this patch.  This patch fixes this.

Signed-off-by: Luben Tuikov <ltuikov@yahoo.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

gitweb/gitweb.perl

@@ -465,6 +465,7 @@ sub esc_html {
 	$str = decode("utf8", $str, Encode::FB_DEFAULT);
 	$str = escapeHTML($str);
 	$str =~ s/\014/^L/g; # escape FORM FEED (FF) character (e.g. in COPYING file)
+	$str =~ s/\033/^[/g; # "escape" ESCAPE (\e) character (e.g. commit 20a3847d8a5032ce41f90dcc68abfb36e6fee9b1)
 	return $str;
 }