Blur and other settings should be treaten globally for the desktop client

[nickvergessen]

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When using things like backgorund blur, which camera, etc. we store some of the information depending on the conversation token. For some things like Camera/Mic on/off that makes sense to keep on a per-conversation-level. But e.g. whether or not to blur your background could/should be globally. I think we just followed the existing pattern when introducing it and since it depends on your hardware whether it's okay/good to do that, we could not store it in the talk settings. But for the desktop client the hardware barely changes, so I think it would be good to have it as a global setting.

• Might depend on #27