fix(client): No onAfterRouteChanged called after popstate

[xiaodong2008]

This Pull Request Fix issue #3226: No onAfterRouteChanged called after popstate

In src/client/app/router.ts popstate eventListener, it should call onAfterRouteChanged hook after loadPage,
but it is missing.

...
    window.addEventListener('popstate', (e) => {
      loadPage(
        normalizeHref(location.href),
        (e.state && e.state.scrollPosition) || 0
-      )
+      ).then(() => {
+        router.onAfterRouteChanged?.(location.href)
+      })
    })
...

Before Fix:

After Fix: