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: https://github.com/ksnip/kImageAnnotator/blob/e3bc6b067030a603158aad2e8e45b67ab7932fb3/src/common/constants/Constants.h#L34 So it ignores minimumSizeHint of the spin box, triggering the fallback.