Fix assignPresenter method

...html5/imports/api/users/server/methods/assignPresenter.js

...tton-html5/imports/api/users/server/methods/muteToggle.js

...-html5/imports/api/users/server/methods/setEmojiStatus.js

...l5/imports/api/users/server/modifiers/handleLockingMic.js

...imports/api/users/server/modifiers/setUserLockedStatus.js

bigbluebutton-html5/imports/api/users/server/publishers.js

...luebutton-html5/imports/startup/server/userPermissions.js

bigbluebutton-html5/server/main.js