Attempt to fix bladeburner.process() issue

For a certain user, it appears that the engine attempts to route to the
bitverse screen before the router is properly initialized. I could not
reproduce the problem on my side and we were not able to extract his
save game, so this is a blind shot if it'll work or not.

src/ui/GameRoot.tsx

@@ -111,6 +111,7 @@ const useStyles = makeStyles((theme: Theme) =>
 );
 
 export let Router: IRouter = {
+  isInitialized: false,
   page: () => {
     throw new Error("Router called before initialization");
   },
@@ -266,6 +267,7 @@ export function GameRoot({ player, engine, terminal }: IProps): React.ReactEleme
   }
 
   Router = {
+    isInitialized: true,
     page: () => page,
     allowRouting: (value: boolean) => setAllowRoutingCalls(value),
     toActiveScripts: () => setPage(Page.ActiveScripts),