gitweb: Remove workaround for git-diff bug fixed in f82cd3c

Remove workaround in git_blobdiff for error in git-diff (showing
reversed diff for diff of blobs), corrected in commit f82cd3c
Fix "git diff blob1 blob2" showing the diff in reverse.  which
is post 1.4.2-rc2 commit.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

gitweb/gitweb.perl

@@ -2834,8 +2834,7 @@ sub git_blobdiff {
 		}
 
 		# open patch output
-		#open $fd, "-|", $GIT, "diff", '-p', $hash_parent, $hash
-		open $fd, "-|", $GIT, "diff", '-p', $hash, $hash_parent
+		open $fd, "-|", $GIT, "diff", '-p', $hash_parent, $hash
 			or die_error(undef, "Open git-diff failed");
 	} else  {
 		die_error('404 Not Found', "Missing one of the blob diff parameters")