Gap above dock setting doesn't work when dock is hidden.

Describe the bug
If your macOs dock is on auto hide, the gap above dock setting doesn't work. The same occurs if your dock is not on autohide, but hidden due to it being on another monitor, etc.

Device information:

  • Type of Mac: Macbook Pro 2016 13"
  • macOS version: Mojave 10.14
  • BetterTouchTool version: 2.800