Only show hosting link if domain == matrix.org

[dbkr]

Fixes element-hq/element-web#9059

[t3chguy]

Maybe it should be if the HS is the default, so that then it can actually be controlled via config,json

Otherwise what if I'm some other big HS running my own Modular-like service, I'd have to modify the source

[jryans]

Maybe it should be if the HS is the default

It's currently slightly tricky to do today, since both default_hs_url and default_server_name can impact this. Checking MatrixChat's defaultHsUrl state should be correct, but that's not so easy to access where needed at the moment. I'd suggest filing for a future improvement if it's desired for others too.

[jryans]

This looks good to me, thanks! We should think about how to evolve this so it's not specific to just matrix.org, assuming others want something like that.

[dbkr]

Plus anyone who hosts their own HS + Riot will set thew default HS to their HS and they don't want to be directing people to other hosting.