gitweb: Use @diff_opts while using format-patch

Make git-format-patch (used by 'patch' and 'patches' views) use the
same rename detection options that git-diff and git-diff-tree (used
by 'commitdiff', 'blobdiff', etc.) use.
Signed-off-by: NPavan Kumar Sunkara <pavan.sss1991@gmail.com>
Acked-by: NJakub Narebski <jnareb@gmail.com>
Acked-by: NGiuseppe Bilotta <giuseppe.bilotta@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

gitweb/gitweb.perl

@@ -6117,8 +6117,8 @@ sub git_commitdiff {
 			}
 			push @commit_spec, '--root', $hash;
 		}
-		open $fd, "-|", git_cmd(), "format-patch", '--encoding=utf8',
-			'--stdout', @commit_spec
+		open $fd, "-|", git_cmd(), "format-patch", @diff_opts,
+			'--encoding=utf8', '--stdout', @commit_spec
 			or die_error(500, "Open git-format-patch failed");
 	} else {
 		die_error(400, "Unknown commitdiff format");