gitweb: Fix Atom feed <logo>: it is $logo, not $logo_url
gitweb: Fix Atom feed <logo>: it is $logo, not $logo_url

Fix contents of Atom feed <logo> element; it should be URL
of $logo, not URL pointed by logo link.

Signed-off-by: Jakub Narebski <a6a1517a087f9f64a72f41a0de57ff01fbb0e412@gmail.com>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git