Modifiers don't work

[ghost]

If you'd like to put out an incentive for fixing this bug, you can do so at https://issuehunt.io/r/bk138/gromit-mpx

Describe the bug
If I try pressing Shift or Ctrl, the colors don't change.

To Reproduce

1. Open gromit-mpx
2. Click F9
3. Press Shift
4. Draw
5. The color stays red

Expected Behavior
The color should change

Desktop (please complete the following information):

• OS and version: Linux Mint Cinnamon 20.1
• Xorg version used: 1:7.7+19ubuntu14
• Wayland version used:
  Not sure how to check that:

apt-cache show mutter | grep Version
Version: 3.36.9-0ubuntu0.20.04.1
Version: 3.36.1-3ubuntu3

Is my understanding of how the program should work incorrect, or is it related to my environment?

[bk138]

Dupe of #106. Next time please check if your issue was already reported :-)

[ghost]

P.S. In my case it was that I didn't know I had to put the config file inside ~/.config/. Now it works