fixed: stop button was not hidden when screen sharing aborted

src/lib/VueJanus.vue

@@ -194,6 +194,8 @@
                 }
             },
             onlocalstreamScreen (stream) {
+                if(!this.screenShareStarted)
+                    this.screenShareStarted=true;
                 this.$refs.ownstreamscreen.srcObject = stream
             },
             shareScreenStart (capture) {
@@ -211,7 +213,6 @@
                         onlocalstream: this.onlocalstreamScreen
                     }
                 )
-                this.screenShareStarted=true;
             },
             screenShareStop(){
                 var srcObject=this.$refs.ownstreamscreen.srcObject;