Fix magnifier only showing while moving the mouse, fix magnifier not unloading with ShowMagnifierNever setting
SelectionEditor: Don't call setShowMagnifier in hoverMoveEvent
This is what caused the magnifier to only show while moving the mouse. Showing the magnifier should already be handled in keyPressEvent.
CaptureOverlay: Fix checking the wrong showMagnifier property when activating the magnifier loader
The bug didn't actually have a noticeable effect on observed behavior, but the new code is the intended behavior. It should save a bit of RAM when the user has the setting to never show the magnifier.