[Fixes bug #986932] Clear out the changes made to the Tool Layer by the Paint Bucket tool.
[Fixes bug #986932] Clear out the changes made to the Tool Layer by the Paint Bucket tool.

Fixes an issue where Undo appeared to not work for the Paint Bucket since the changes remained in the Tool Layer.

jakeclawson/Pinta,Fenex/Pinta,PintaProject/Pinta,Mailaender/Pinta,jakeclawson/Pinta,Mailaender/Pinta,PintaProject/Pinta,PintaProject/Pinta,Fenex/Pinta