Fix Field.formfield(), GeometryField.formfield() methods (#1778)

This partially reverts and fixes bugs introduced in 9010b5f.

django-stubs/contrib/gis/db/models/fields.pyi

@@ -109,8 +109,13 @@ class GeometryField(BaseSpatialField[_ST, _GT]):
         error_messages: _ErrorMessagesMapping | None = ...,
     ) -> None: ...
     def formfield(  # type: ignore[override]
-        self, *, form_class: type[GeometryField] | None = ..., geom_type: str = ..., srid: Any = ..., **kwargs: Any
-    ) -> GeometryField: ...
+        self,
+        *,
+        form_class: type[forms.GeometryField] | None = ...,
+        geom_type: str = ...,
+        srid: Any = ...,
+        **kwargs: Any,
+    ) -> forms.GeometryField: ...
     def select_format(self, compiler: Any, sql: Any, params: Any) -> Any: ...
 
 class PointField(GeometryField[_ST, _GT]):

django-stubs/db/models/fields/__init__.pyi

@@ -205,10 +205,10 @@ class Field(RegisterLookupMixin, Generic[_ST, _GT]):
     # TODO: plugin support
     def formfield(
         self,
-        form_class: type[Field] | None = ...,
+        form_class: type[forms.Field] | None = ...,
         choices_form_class: type[forms.ChoiceField] | None = ...,
         **kwargs: Any,
-    ) -> Field: ...
+    ) -> forms.Field: ...
     def save_form_data(self, instance: Model, data: Any) -> None: ...
     def contribute_to_class(self, cls: type[Model], name: str, private_only: bool = ...) -> None: ...
     def to_python(self, value: Any) -> Any: ...