Provide form_overrides as .overrides field to ModelConverter so wtfpeewee can...

Provide form_overrides as .overrides field to ModelConverter so wtfpeewee can use it to generate forms.

flask_admin/contrib/peewee/form.py

@@ -90,6 +90,8 @@ class CustomModelConverter(ModelConverter):
         self.converters[DateField] = self.handle_date
         self.converters[TimeField] = self.handle_time
 
+        self.overrides = getattr(self.view, 'form_overrides', None) or {}
+
     def handle_foreign_key(self, model, field, **kwargs):
         loader = getattr(self.view, '_form_ajax_refs', {}).get(field.name)