revert: "feat: improve predictive back (#1487)"

This reverts commit 06ff36c836.

Signed-off-by: validcube <pun.butrach@gmail.com>

lib/services/manager_api.dart

@@ -582,8 +582,8 @@ class ManagerAPI {
     return showDialog(
       barrierDismissible: false,
       context: context,
-      builder: (context) => PopScope(
-        canPop: false,
+      builder: (context) => WillPopScope(
+        onWillPop: () async => false,
         child: AlertDialog(
           backgroundColor: Theme.of(context).colorScheme.secondaryContainer,
           title: I18nText('warning'),