add BackToQueryResults to JsonRPCPublicAPI

Author: cibere

Flow.Launcher.Core/Plugin/JsonRPCV2Models/JsonRPCPublicAPI.cs

@@ -173,5 +173,10 @@ public void OpenAppUri(string appUri)
         {
             _api.OpenAppUri(appUri);
         }
+
+        public void BackToQueryResults()
+        {
+            _api.BackToQueryResults();
+        }
     }
 }