Spinbox drawn without border with latest Breeze

[Sodivad]

Original report:
https://bugs.kde.org/show_bug.cgi?id=432395

Fabian Vogt wrote:

The issue with Spectacle is that kImageAnnotator hardcodes a fixed size for the spin boxes:

kImageAnnotator/src/common/constants/Constants.h

Line 34 in e3bc6b0

const QSize SettingsWidgetSize(64, 32);

So it ignores minimumSizeHint of the spin box, triggering the fallback.