Too much permission needs to be added for roles to convert a bundle type

Problem/Motivation

For a non-administrate role to convert a bundle type, the "Administer Convert Bundles" must also be assigned for the user to access the page. This gives more access than it is required to make a simple convert.

Steps to reproduce

If you assign only a entity_type: Convert Bundle permission, the user can see the Convert Bundle option in the edit page of the entity, but then the user has no access to the page.

Proposed resolution

Alter the permission of the form so the user can access it. Preferably in the buildForm.