add enabled config to chat in settings.yml

...ml5/imports/ui/components/chat/message-form/component.jsx

...on-html5/imports/ui/components/join-handler/component.jsx

...on-html5/imports/ui/components/lock-viewers/component.jsx

...ui/components/settings/submenus/application/component.jsx

...n-html5/imports/ui/components/shortcut-help/component.jsx

...n-html5/imports/ui/components/subscriptions/component.jsx

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

...r-participants/user-list-item/user-dropdown/component.jsx

bigbluebutton-html5/private/config/settings.yml