Always update internally stored AUI floating frame position.

Always update internally stored AUI floating frame position.

Update the internally stored position of a floating AUI frame even if the user
is dragging it too fast to update its position on screen. This prevents the
frame from snapping back to the initial position when movement is over.

Closes #13014.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67344 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775