scripts: fix SC2268 shellcheck warning in test_lib.sh

[robin-vidal]

Remove x-prefix pattern in comparison that is no longer needed in modern shells as per shellcheck SC2268.

Fixes #21710

[k8s-ci-robot]

Hi @robin-vidal. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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[henrybear327]

/ok-to-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.24%. Comparing base (b2a2cbb) to head (5874f81).
⚠️ Report is 35 commits behind head on main.

Additional details and impacted files

see 33 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21711      +/-   ##
==========================================
- Coverage   70.28%   70.24%   -0.05%     
==========================================
  Files         425      426       +1     
  Lines       35145    35200      +55     
==========================================
+ Hits        24703    24727      +24     
- Misses       9047     9085      +38     
+ Partials     1395     1388       -7     

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[ivanvc]

LGTM. Thanks, @robin-vidal.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ivanvc, robin-vidal, serathius

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