It is important to add RawGameController instances to the vector in the
initialization callback, because some games check the vector, as well
as the Gamepad class vector in the OnGameControllerAdded callback.

This also removes the OnGameControllerAdded failure case, to avoid
leaking controllers that were already added to the controller vector,
and instead rely on the OnGameControllerRemoved call to do the cleanup.
Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>