Fix double-escaping of path segments on 1.6.1+

As of:

https://github.com/openSUSE/osc/commit/3f14cef53a853296d7f60bf7b14eb86615842cf9



`osc.core.makeurl` will escape path comonents itself, so calling
`pathname2url` ends up double-escaping, resulting in 404 errors with
filenames that have special characters.

Signed-off-by: Ryan Gonzalez <ryan.gonzalez@collabora.com>