allowed_url: do not use Href::with_fragment

A plain match in the callers is actually shorter and more clear
7 jobs for cleanup in 30 minutes and 16 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #189916
fedora test

00:08:26

 
  Lint
manual #189918
allowed to fail manual
clippy
passed #189917
rustfmt

00:00:37

passed #189919
tarball

00:12:38

 
  Cross Distro
passed #189922
debian_i386:testing

00:08:34

passed #189921
debian:testing

00:09:11

passed #189920
fedora:rawhide

00:07:33