Add Graceful Assert for `KoToolBox::buttonSize` Display Indexing
Something about my specific development environment was causing a crash due to QGuiApplication::screens() indexing throwing an Out of Range error. It likely has something to do with my vertical-right oriented display I just set up. I'll do more investigation of this issue, and whether its a QT or GNOME bug. For now, preventing a hard crash for simple GUI button size scaling is probably appropriate.
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