ice: Change number of XDP TxQ to 0 when destroying rings

When XDP Tx rings are destroyed the number of XDP Tx queues
is not changing. This patch is changing this number to 0.

Signed-off-by: Marta Plantykow <marta.a.plantykow@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>