Make delete confirmation button red (#741)

lib/providers/apps_provider.dart

@@ -892,6 +892,7 @@ class AppsProvider with ChangeNotifier {
         context: context,
         builder: (BuildContext ctx) {
           return GeneratedFormModal(
+            primaryActionColour: Theme.of(context).colorScheme.error,
             title: plural('removeAppQuestion', apps.length),
             items: !showUninstallOption
                 ? []