Changes the timer auto-stop threshold from 90% to 100% of user count
to prioritize the timer alert sounding for all users over the timer state
being consistent.
Also, puts the user count fetch back to where it was to avoid a race
condition where the number of users when setting the observer is
different than when the timer ends(i.e. users've joined or left the
meeting while the timer was running) causing the timer not to stop or
stop prematurely.
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