flatpak remote-ls -u: only consider apps from the current remote

Check that the origin from the deploy matches the current remote
before listing it as an upgrade.

Closes: #1373
Approved by: mwleeds
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f