fix(router): fix state.routes.at is not a function (#912)

packages/expo-router/src/global-state/routing.ts

@@ -135,7 +135,7 @@ function rewriteNavigationStateToParams(
 ) {
   if (!state) return params;
   // We Should always have at least one route in the state
-  const lastRoute = state.routes.at(-1)!;
+  const lastRoute = state.routes[state.routes.length - 1]!;
   params.screen = lastRoute.name;
   // Weirdly, this always needs to be an object. If it's undefined, it won't work.
   params.params = lastRoute.params
@@ -167,7 +167,7 @@ function getNavigateReplaceAction(
   lastNavigatorSupportingReplace: NavigationState = parentState
 ): NavigationAction {
   // We should always have at least one route in the state
-  const route = state.routes.at(-1)!;
+  const route = state.routes[state.routes.length - 1]!;
 
   // Only these navigators support replace
   if (parentState.type === "stack" || parentState.type === "tab") {