Fix duplicated event listeners in ParticipantAnalyzer #3911
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Follow up to #3839
The event listeners where not properly stopped when a Peer was set, so if the same Peer was set twice the listeners were duplicated, which in turn could lead to errors due to only one of them being removed.
How to test
Result with this pull request
The call is started.
Result without this pull request
The call is not started. Browser console shows an error about calling
setAnalysisEnabledAudioon a null object.