Hide media in report modal regardless of whether they are marked sensitive

The rationale behind this is that if the user wants to report violent media,
they might not want to see it repeatedly. The “sensitive” property is still
kept, displaying different messages for hidden media depending on whether
they are marked as sensitive.

app/javascript/flavours/glitch/components/media_gallery.js

@@ -202,6 +202,7 @@ export default class MediaGallery extends React.PureComponent {
 
   static propTypes = {
     sensitive: PropTypes.bool,
+    revealed: PropTypes.bool,
     standalone: PropTypes.bool,
     letterbox: PropTypes.bool,
     fullwidth: PropTypes.bool,
@@ -216,7 +217,7 @@ export default class MediaGallery extends React.PureComponent {
   };
 
   state = {
-    visible: !this.props.sensitive || displaySensitiveMedia,
+    visible: this.props.revealed === undefined ? (!this.props.sensitive || displaySensitiveMedia) : this.props.revealed,
   };
 
   componentWillReceiveProps (nextProps) {