UPnP: remove SAT>IP channel list fallback

UPnP: remove SAT>IP channel list fallback

When introducing SAT>IP support, we added a fallback mechanism on
officially published channel lists in case the user neither specified
a custom list nor the used set-top box provided one.

With the end of the SAT>IP Alliance that was dissolved 3 years ago, the
fallback server is no longer available and there will be no replacement
so this feature was removed.

Fixes #28684

(cherry picked from commit 3df7b6e1187030591febd8e1bdd2712c0d6af132)

Gbp-Pq: Name 0014-UPnP-remove-SAT-IP-channel-list-fallback.patch