t/zbd: Fix a bug in reset_zone() for all zones reset

t/zbd: Fix a bug in reset_zone() for all zones reset

The bash function reset_zone() is expected to reset all zones when -1 is
provided as its second argument. However, it fails to reset all zones
using blkzone command because of wrong and unnecessary options provided
to blkzone. Remove the option to fix it.

This failure was found with running test-zbd-support with -r option.

Reviewed-by: Damien Le Moal <damien.lemoaal@wdc.com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>