Mandatory fields are highlighted red on page load. It should only highlight if we save the document.

**Before:** Form

https://user-images.githubusercontent.com/30859809/168791201-049c1de2-b7f5-4dff-bf40-093ff96d4510.mov

**After:** Form

https://user-images.githubusercontent.com/30859809/168791164-45e2289b-2d2c-4ebb-8b4d-cd2932140572.mov

**Before:** Dialog

https://user-images.githubusercontent.com/30859809/168791207-800ba9e5-b4eb-419f-8a99-f94916c21c79.mov

**After:** Dialog

https://user-images.githubusercontent.com/30859809/168791210-f2761d23-3a60-40c2-8aff-2d2cebbd77fa.mov

Resolves https://github.com/frappe/frappe/issues/16866