DCC Editor "Change Palette" cannot be closed by the window's X button

[bbrucee]

Describe the bug

As title says, the DCC Editor "Change Palette" cannot be closed by the window's X button. When the X button is pressed the window closes but reopens

To Reproduce

Steps to reproduce the behavior:

1. Open a DCC file
2. Click on DCC Editor menu dropdown
3. Select Change Palette
4. Attempt to X out of the window

Expected behavior

Window closes with the behavior of "Don't use any palette" or "Exit"

Screenshots

If applicable, add screenshots to help explain your problem.

(Screen flickers in gif are from recording method going wrong, unrelated to the bug)

[bbrucee]

Stumbled on to this bug while investigating the DCC widget. It looks like it is caused by selectPalette boolean not being set to false when window is closed by the X button

https://github.com/OpenDiablo2/HellSpawner/blob/master/hswindow/hseditor/hsdcceditor/dcc_editor.go#L83

HellSpawner/hswidget/select_palette_widget.go

Line 45 in c07ca9a

closeCB: closeCB,

(closeCB does not fire)