Don't pass &muteOnStart=false on create

[Ithanil]

This is a reopening of an issue that apparently was solved in GL2:
#2398

However, I'm actually not sure if this is not rather (or at least also) an issue for BigBlueButton itself. In my opinion there should be a way to set options like muteOnStart as overrides.

Possible Solution

In app/services/meeting_starter.rb add

options.delete('muteOnStart') unless options['muteOnStart'].presence == true

to MeetingStarter.call before BBB API is called.