fix: route name not being set on ios, resulting in unnamed routes

[fuzzzer]

We noticed inconsistent behaviour between ios and android navigation.

For example when registering page:

 MicroAppPage(
          route: routes.initial,
          pageBuilder: PageBuilder(
            widgetBuilder: (context, settings) => const InitialPage(),
          ),
        ),

When registering route without custom MicroPageTransitionType route name is lost.
and cheking current route name always returns null on IOS.
Applied simple fix, I made sure route names are correctly initialized on IOS as well.

(flutter version 3.24.3)

[emanuel-braz]

Hi @fuzzzer thank for the contribution, it looks good to me! I gonna merge it and include in next release. 🙌