* Gcode Statistics Panel - Persist open/close state
Bug: On slicing a model, the Statistics Panel would be reset to being open (regardless of if the user had shut it earlier)
Fix: Now on app open the Statistics Panel will be open, but if the user closes it, its state will persist (regardless of slicing again)
https://github.com/SoftFever/OrcaSlicer/discussions/6021
* Gcode Statistics Panel - fold/unfold button width fix
Issue: The fold/unfold button width is too wide (It seems CalcTextSize is making the button wider than necessary)
Fix: Set the width to a correct fixed value
