Always update the value of generic spin control when leaving it.

Always update the value of generic spin control when leaving it.

We could be left with an invalid value in the control when leaving it. E.g. in
the widgets sample whose double spin control has range from 0 to 10, 123 could
be entered in it and was not replaced by 10 when the control lost focus. This
happened because the code didn't bother to update the text control if its
contents already corresponded to the internally stored value -- but this was
wrong as it could have a different representation.

Just always update the text unconditionally when synchronizing it with the
internal value.

See #12004.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64228 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775