net/mlx5e: Fix quota counting in aRFS expire flow

Quota should follow the amount of rules which do expire, and not the
number of rules that were examined, fixed that.

Fixes: 18c908e4 ("net/mlx5e: Add accelerated RFS support")
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>