Made sure non-moderators can user userlist for mute/unmute.

...utton-html5/imports/ui/components/user-list/component.jsx

...utton-html5/imports/ui/components/user-list/container.jsx

...uebutton-html5/imports/ui/components/user-list/service.js

...s/ui/components/user-list/user-list-content/component.jsx

...er-list/user-list-content/user-participants/component.jsx