Colormap Preset picker does not have priority on MacOS binaries

@cory.quammen @maxwelljackson002 @berkgeveci @patchett2002

Reproduced on multiple MacOS versions. I don't hit this issue on Ubuntu or Windows 10 binaries.

For MacOS binaries, the colormap preset picker window does not have priority over other panels and can get stuck behind things. This is more an annoyance than anything.

Steps to reproduce:

Use MacOS
Wavelet -> Color by RTData variable
Separate a panel from the GUI, the Pipeline Browser for example
Open the colormap editor and the colormap preset picker
Move the panels so they overlap.

It is expected to be able to switch which panel is on top of the stack. This is possible on Linux and Windows binaries.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information