fix plex discovery

Sources/LocalNetworkConnectivity/ServerDiscovery/VLCLocalNetworkServiceBrowserNetService.m

@@ -114,10 +114,8 @@
     if ([self.resolvedLocalNetworkServices vlc_indexOfServiceWithNetService:localNetworkService.netService] != NSNotFound) {
         return;
     }
-    dispatch_sync(dispatch_get_main_queue(), ^{
-        [self.resolvedLocalNetworkServices addObject:localNetworkService];
-        [self.delegate localNetworkServiceBrowserDidUpdateServices:self];
-    });
+    [self.resolvedLocalNetworkServices addObject:localNetworkService];
+    [self.delegate localNetworkServiceBrowserDidUpdateServices:self];
 }
 @end