chore(mobile): correctly rename person form state class (#31428)

chore: correctly name _PersonBirthdayEditFormState

Co-authored-by: Arthur <arthur@freye.in>

mobile/lib/presentation/widgets/people/person_edit_birthday_modal.widget.dart

@@ -16,10 +16,10 @@ class PersonBirthdayEditForm extends ConsumerStatefulWidget {
   const PersonBirthdayEditForm({super.key, required this.person});
 
   @override
-  ConsumerState<PersonBirthdayEditForm> createState() => _PersonNameEditFormState();
+  ConsumerState<PersonBirthdayEditForm> createState() => _PersonBirthdayEditFormState();
 }
 
-class _PersonNameEditFormState extends ConsumerState<PersonBirthdayEditForm> {
+class _PersonBirthdayEditFormState extends ConsumerState<PersonBirthdayEditForm> {
   late DateTime _selectedDate;
 
   @override