dir: Ignore trailing slash in remote URIs

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Currently if you have a remote configured with the URL
"https://dl.flathub.org/repo/" (as you would if you use the flatpakrepo
file) and you use a flatpakref file which specifies the URL
"https://dl.flathub.org/repo", Flatpak tries to add a duplicate remote
because it doesn't see those URLs as equal. So ignore the trailing slash
when comparing remote URLs. OSTree works equally well with both kinds
(it uses g_build_filename()).

Flathub served flatpakref files with URLs missing a trailing slash until
this commit:
https://github.com/flathub/ansible-playbook/commit/b20694f09

Also, add a unit test that fails without this patch.

Fixes https://github.com/flatpak/flatpak/issues/2979

Closes: #3065
Approved by: alexlarsson

(cherry picked from commit af4504c8d3)

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