Add test for absence of events from wxSpinCtrlDouble ctor.

Add test for absence of events from wxSpinCtrlDouble ctor.

Run the same NoEventsInCtor() test as we already had for wxSpinCtrl for
wxSpinCtrlDouble as well.

Unfortunately currently there is no way to reuse the tests between these two
classes, we should refactor these test cases to use a common
SpinCtrlTestCaseBase<T> base class.

See #15375 which fixed the underlying bug.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74630 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775