Don't reorder room list when prompting user for forwarding room

[BurnyBoi]

Is your suggestion related to a problem? Please describe.

When going to forward a message, if your room list is ordered by activity, it's very possible to accidentally click the wrong room when the rooms reorder right when you go to click.

Describe the solution you'd like.

Don't reorder the room list when the user is being prompted to choose a room to forward to. Instead wait until either they choose a room or cancel the forward.

Describe alternatives you've considered.

This doesn't happen with A-Z ordering on the room list but that's not acceptable for those with large room lists.

[t3chguy]

The forwarding UX is changing entirely, this isn't relevant for the new style: matrix-org/matrix-react-sdk#5999