Make room IDs case insensitive

[pascalwengerter]

Just had complaints from family members when they tried to join our Christmas call 😅 Turns out they were sending each other the room name by chat and the chat program turns the first character of a message to uppercase so some people waited in palava.tv/foo while others typed palava.tv/ and then pasted "Foo" there, ending up in another room.

Need to check if this is a backend or front-end topic and whether that was a conscious design decision, but from my limited experience it's confusing for a non-tech user