Update ctk_canvas.py - coords issue fixed

[DeltaGa]

MAJOR CHANGES

• revamped the coords method in CTkCanvas by adding return statements to avoid the event when it does not return any value.

[FedericoSpada]

Hi,
I would not return default coordinates: since the coords() method has been inherited by the parent class, I would simply invoke the original method and return its output unchanged.
If you can do this change, I'll merge it.

[FedericoSpada]

I've only seen in a second moment that the same problem was solved in #2240.
I've decided to merge that PR because more complete and already has the change I've requested in my previous comment.