Fix issue with mute action and saga

Author: likethemammal

src/components/Audio/Audio.sagas.js

@@ -21,11 +21,7 @@ function* onVolumeMuteToggle() {
     const audio = yield select(_audio)
     const muted = yield select(_muted)
 
-    if (muted) {
-        audio.muted = true
-    } else {
-        audio.muted = false
-    }
+    audio.muted = !muted
 
     yield put({type: types.AUDIO__AUDIO_UPDATED, audio,})
 }

src/components/Audio/Audio.units.js

@@ -15,7 +15,7 @@ export const playing = (paused)  => !paused
 export const muted = ({ muted })  => muted
 
 export const volumeFormatted = (volume, muted) => {
-    return muted ? 0 : volume
+    return volume
 }