[stable17] Do not immediately join the conversation in Files app #2423
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Related to #2347
Fixes #1366
Before as soon as the chat tab loaded if the file was shared the user automatically joined the conversation. Now the conversation must be explicitly joined by clicking a button in the chat tab. This prevents accidentally joining a room or even creating them when opening the details of a different file.
Note that in this current version the user always needs to explicitly click the Join button to see the chat messages (except if she changed to a different tab and went back to the Chat tab). It would be better if the chat messages are automatically shown if the conversation is already created and the user has already joined, but for now always having to join should be good enough (and better than accidentally creating/joining the conversation).