Enable group stream boxes when in draft mode

They are disabled when editing a proposal in general, but in the case of
a draft, the users sometimes need to be able to edit them in order to
finish an application.

This fix may be incomplete, as it does not allow the group forms to have
the full functionality of hiding the followup forms when "No" is
selected, and showing them when "Yes" is selected.

Semi fixes issue #4031

hypha/apply/funds/views.py

@@ -1487,7 +1487,10 @@ class that doesn't validate required fields while saving.
         )
         field_blocks = self.object.get_defined_fields()
         for field_block in field_blocks:
-            if isinstance(field_block.block, GroupToggleBlock):
+            if (
+                isinstance(field_block.block, GroupToggleBlock)
+                and not self.object.is_draft
+            ):
                 # Disable group toggle field as it is not supported on edit forms.
                 form_fields[field_block.id].disabled = True
         return type(