fix(analytics): prejoin property.

[hristoterezov]

No description provided.

[saghul]

Not a huge fan of the approach because it spreds across features and feels kinda brittle. Can't we use the same model as with wasLobbyVisible? It's initialized to false and then it's updated here:

jitsi-meet/react/features/analytics/middleware.ts

Line 167 in 3a836eb

wasLobbyVisible: true

[hristoterezov]

Closed in favor of #14177.

@saghul I've tried the same approach as for the lobby for the prejoin property for mobile but it turned out there was potential issue with setting the permanant props before initialization of the analytics. Basically on init we would override all the values with the values from the init. All those are addressed now in the above PR. Could you PTAL?