Fix provider connection check

lib/modules/blockchain_connector/provider.js

@@ -76,7 +76,7 @@ class Provider {
     if (this.type === 'rpc') {
       return !!this.provider;
     } else if (this.type === 'ws') {
-      return this.provider && this.provider.connected;
+      return this.provider && this.provider.connection._connection.connected;
     }
 
     return false;