get correct best size for wxSpinButton

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75119 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
fix GCC warning "logical ‘or’ applied to non-boolean constant"

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75120 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775