test/stats.bats: fix typo in a variable name
test/stats.bats: fix typo in a variable name

As pointed out by shellcheck:

> In test/stats.bats line 72:
>     run crictl stats -o json "$crt2_id"
>                               ^------^ SC2154: crt2_id is referenced but not assigned.

The test works just fine though, because

 1. it is the same as running crictl stats without ID, in which case it
    shows stats for all IDs.

 2. the values obtained are not compared in any way, just printed.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

kubernetes-incubator/ocid,kubernetes-incubator/cri-o,nalind/cri-o,nalind/cri-o,nalind/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/ocid,kubernetes-incubator/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/ocid