config: Whitelists enable{Remb,Tcc} and minParticipants.

react/features/base/config/functions.js

     'enableLipSync',
     'enableLocalVideoFlip',
     'enableRecording',
+    'enableRemb',
     'enableStatsID',
     'enableTalkWhileMuted',
+    'enableTcc',
     'enableUserRolesBasedOnToken',
     'etherpad_base',
     'failICE',
     'iAmSipGateway',
     'iceTransportPolicy',
     'ignoreStartMuted',
+    'minParticipants',
     'nick',
     'openBridgeChannel',
     'p2p',