remove TODO for slot name collisions (#2248)

After giving this a deep read, I'm not convinced we should change
this behavior. I'm removing the TODO.

Author: joelhawksley

lib/view_component/slotable.rb

@@ -333,7 +333,6 @@ def validate_singular_slot_name(slot_name)
 
       def raise_if_slot_registered(slot_name)
         if registered_slots.key?(slot_name)
-          # TODO remove? This breaks overriding slots when slots are inherited
           raise RedefinedSlotError.new(name, slot_name)
         end
       end