Use the user's pre-existing HS when config validation fails #9892
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Requires matrix-org/matrix-react-sdk#3043
Fixes #9835
This is a temporary measure for #9828
Only applies if the user appears to be logged in. If the user is not logged in, we scream loudly.
A note on the messaging: The errors being displayed to users come from deep within the js-sdk, which is not easily translated. Instead of trying to wrestle a homeserver URL into the error, I've just stuck a sentence into the error box to hopefully make it clear that it's not the user's fault.
Pretend that says "Homeserver URL does not appear to be a valid homeserver" instead of "Unexpected error"