Handle map reset when the game is loaded/unloaded.

https://github.com/dcs-liberation/dcs_liberation/issues/2039

Partial fix for
https://github.com/dcs-liberation/dcs_liberation/issues/2045 (now works
in the new map, old one not fixed yet).

client/src/App.tsx

@@ -1,17 +1,14 @@
 import LiberationMap from "./components/liberationmap";
 import useEventStream from "./hooks/useEventSteam";
 import useInitialGameState from "./hooks/useInitialGameState";
-import { LatLng } from "leaflet";
 
 function App() {
-  const mapCenter: LatLng = new LatLng(25.58, 54.9);
-
   useInitialGameState();
   useEventStream();
 
   return (
     <div className="App">
-      <LiberationMap mapCenter={mapCenter} />
+      <LiberationMap />
     </div>
   );
 }