Fix hardcoded frame rate for frame by frame video navigation in web UI (#15198)

app/javascript/mastodon/components/status.js

@@ -391,6 +391,7 @@ class Status extends ImmutablePureComponent {
             {Component => (
               <Component
                 preview={attachment.get('preview_url')}
+                frameRate={attachment.getIn(['meta', 'original', 'frame_rate'])}
                 blurhash={attachment.get('blurhash')}
                 src={attachment.get('url')}
                 alt={attachment.get('description')}