The code for stripping the query and fragment from file:// URIs was
wrong, as it would not properly strip a query if there was a fragment.

Fortunately, that code was actually useless, as the "stripped URI" was
passed to g_filename_from_uri() that does proper stripping itself.

So simply drop this extra unnecessary stripping logic from GLocalVFS's
get_file_for_uri() and let g_filename_from_uri() do all the work.