case-lib/apause.exp: fix error message and comments

[marc-hb]

cc:

• https://github.com/thesofproject/sof-test/pull/931
• https://github.com/thesofproject/linux/issues/5048
• https://github.com/thesofproject/linux/issues/5109
• https://github.com/thesofproject/linux/pull/5041

[marc-hb]

Mmmm... why did https://sof-ci.01.org/softestpr/PR1222/build668/devicetest/index.html (and others) run with the old, broken SOF commit d629e521020c? Weird.

EDIT: and again. It must be using the last daily build. Will try again tomorrow.

[marc-hb]

SOFCI TEST

[marc-hb]

Known LNL pause issue https://github.com/thesofproject/linux/issues/5109 in https://sof-ci.01.org/softestpr/PR1222/build676/devicetest/index.html?model=LNLM_RVP_NOCODEC&testcase=check-pause-resume-capture-100

Shellcheck error https://github.com/thesofproject/sof-test/actions/runs/10001280887/job/27644617707?pr=1222 is not new.

Everything else 100% green.