Fix some of the Javascript linting issues, as well as bugs and unneeded divergences with upstream (#2208)

* Run eslint --fix

* Fix linting issues in video player and reduce divergences with upstream

This includes a behavior change of not auto-looping videos anymore. I don't
remember loops being ever intended, and they have been removed from upstream
a while ago, but we somehow missed the change.

* Fix lint issues in `app/javascript/flavours/glitch/selectors/index.js`

Those were basically caused by dead code that isn't present upstream, so
that brings us closer to upstream as well.

* Fix linting issue and bug in streaming/index.js

* Fix linting issues in config/webpack/shared.js

* Fix unused import in flavours/glitch/features/ui/index.js

* Fix linting issues and reduce divergences from upstream in flavours/glitch/features/ui/components/video_modal.jsx

* Fix linting issues in flavours/glitch/reducers

* Fix linting issues in glitch-soc onboarding modal

* Fix linting issues in flavours/glitch/features/ui/components/navigation_panel.jsx

* Remove dead code for unused local setting navbar_under

* Fix various linting issues

* Fix linting issues in flavours/glitch/components/scrollable_list.jsx and reduce divergences with upstream

app/javascript/flavours/glitch/features/status/components/card.jsx

@@ -3,7 +3,6 @@ import PropTypes from 'prop-types';
 import Immutable from 'immutable';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import { FormattedMessage } from 'react-intl';
-import punycode from 'punycode';
 import classnames from 'classnames';
 import { decode as decodeIDNA } from 'flavours/glitch/utils/idna';
 import Icon from 'flavours/glitch/components/icon';
@@ -164,7 +163,7 @@ export default class Card extends React.PureComponent {
   }
 
   render () {
-    const { card, compact, defaultWidth } = this.props;
+    const { card, compact } = this.props;
     const { width, embedded, revealed } = this.state;
 
     if (card === null) {