Only save a role if permissions have changed

Looks likes this code is already part of the 8.x-1.3

@coaston On what do you base your claim?

My bad, you are right. I had enabled update in composer.json for this patch. So it was downloaded automatically.

Agreed, this is a better approach and isn't causing permission saves to fail. Committed.

Automatically closed - issue fixed for 2 weeks with no activity.