version 0.11.3 reset custom brush when switch another tool

[alexTitakoff]

Pixelorama version:

0.11.3

OS/device including version:

mac os 10.14.6

Issue description:

Good afternoon!
Thanks to the developers for such a wonderful product.
I found a bug. There was no such thing in version 0.11.2. The custom brush is reset when switching to another tool, in particular the eraser. It's a common movement to switch between an eraser and a brush.

This applies only to custom brushes

Steps to reproduce:

[alexTitakoff]

Maybe it's related to this fix #916

[alexTitakoff]

I installed version 11.2. I was wrong. The same behavior. The point is different. The custom brush is saved in the project. But when restarting the program, it starts to reset when you select another one. . If you do it again, it starts to persist when you switch tools.