[Glitch] Fix initial audio volume not corresponding to what's displayed

Port 755e8c76ab28a99905c66082757d892939e70c49 to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/features/audio/index.js

@@ -125,6 +125,7 @@ class Audio extends React.PureComponent {
         this.wavesurfer.createPeakCache();
         this.wavesurfer.load(this.props.src);
         this.wavesurfer.toggleInteraction();
+        this.wavesurfer.setVolume(this.state.volume);
         this.loaded = true;
       }