Revert "webkit: Skip the repos"

This reverts commit 12f157c5.

We need newer WebKit for hardware acceleration to work, so let's remove
the skip.

jobs.yml

@@ -441,7 +441,6 @@ webkit:
   deb_build_options: ['nocheck', 'parallel=4']
   deb_build_profiles: ['nocheck']
   sloppy: true
-  repo: skip
 wlroots:
   url: https://source.puri.sm/Librem5/wlroots.git
   archs: ['aarch64', 'armhf', 'amd64']