gitweb: Don't use quotemeta on internally generated strings

gitweb: Don't use quotemeta on internally generated strings

Do not use quotemeta on internally generated strings
such as filenames of snapshot, blobs, etc.
quotemeta quotes any characters not matching /A-Za-z_0-9/.
Which means that we get strings like this:

before: linux\-2\.6\.git\-5c2d97cb31fb77981797fec46230ca005b865799\.tar\.gz
after:  linux-2.6.git-5c2d97cb31fb77981797fec46230ca005b865799.tar.gz

This patch fixes this.

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