get isListed from Invidious API

Author: OothecaPickle

src/renderer/views/Watch/Watch.js

@@ -776,6 +776,7 @@ export default defineComponent({
           this.isLive = result.liveNow
           this.isFamilyFriendly = result.isFamilyFriendly
           this.isPostLiveDvr = !!result.isPostLiveDvr
+          this.isUnlisted = !result.isListed
 
           this.captions = result.captions.map(caption => {
             return {