[.qml+python3] How to read Icons KCM configured sizes?

[rokejulianlockhart]

Might be similar to [.qml+python3] How to determine whether icons are enabled? - #6 by ngraham

@ngraham

Use kconfig to get the value (if any) of the ToolButtonStyle key in the Toolbar style group of the global config. If the value isn’t “TextOnly”, then there are icons somewhere in the buttons.