Couple of bug fixes.

Don't try and resole using a path from another FS provider.

Create paths via URIs not via strings, as otherwise it gets
confused with protocols.

Change-Id: Ibb33317ee9ce8d1567535e464c8f59667ea5e65a
Reviewed-on: http://gerrit.dmdirc.com/4043
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager