Unify user-list content style

bigbluebutton-html5/imports/ui/components/note/service.js

.../ui/components/user-list/captions-list-item/component.jsx

...ts/ui/components/user-list/captions-list-item/styles.scss

...er-list/chat-list-item/chat-unread-messages/component.jsx

...user-list/chat-list-item/chat-unread-messages/styles.scss

...ebutton-html5/imports/ui/components/user-list/styles.scss

...s/user-list/user-list-content/breakout-room/component.jsx

...nts/user-list/user-list-content/breakout-room/styles.scss

...rts/ui/components/user-list/user-list-content/styles.scss

...s/user-list/user-list-content/user-captions/component.jsx

...s/user-list/user-list-content/user-messages/component.jsx

...ents/user-list/user-list-content/user-notes/component.jsx

...onents/user-list/user-list-content/user-notes/styles.scss

...ents/user-list/user-list-content/user-polls/component.jsx

...onents/user-list/user-list-content/user-polls/styles.scss

...s/user-list/user-list-content/waiting-users/component.jsx

...nts/user-list/user-list-content/waiting-users/styles.scss