UI: Prevent Restream OAuth disconnection

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Fix the service check for services where its name in the UI does not
match its Auth::Def service string.

In Restream's case, the service name in the UI and rtmp-services is
"Restream.io" while the service name in its Auth::Def is "Restream".
This mismatch causes the `service_check` bool to be false, whereas the
previous condition (`!!main->auth && service.find(main->auth->service())
!= std::string::npos`) would have evaluated to true.

This was broken in commit e6f1daab8c.

Fixes GitHub Issue 5290.

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