fix google map secrets

frontend/ios/Runner/AppDelegate.swift

@@ -9,8 +9,7 @@ import GoogleMaps
     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
   ) -> Bool {
     // load the key from env
-    let key = ProcessInfo.processInfo.environment["GOOGLE_MAPS_API_KEY"]!
-    GMSServices.provideAPIKey(key)
+    GMSServices.provideAPIKey("IOS_GOOGLE_MAPS_API_KEY")
     GeneratedPluginRegistrant.register(with: self)
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }