Fix wxPoint2DInt::operator*= and wxPoint2DInt::operator/= .

These operator functions are respectively adding and subtracting their arguments. Instead let the functions multiply and divide their arguments (like their wxPoint2DDouble counterparts were doing already).

See #10946.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76566 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Cast arguments passed to wxPoint2DInt constructor.

Cast them to wxInt32 (instead of int) as that is the type of the wxPoint2DInt members m_x and m_y.

See #10946.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76567 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775