test(playack): make live dash test take 5 seconds

[gkatsev]

No description provided.

[codecov]

Codecov Report

Merging #1235 (3edb745) into main (7495ead) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1235   +/-   ##
=======================================
  Coverage   86.30%   86.30%           
=======================================
  Files          39       39           
  Lines        9796     9796           
  Branches     2278     2278           
=======================================
  Hits         8454     8454           
  Misses       1342     1342           

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[gkatsev]

Increasing the playFor timer seems to make the test more reliable, particularly, on Firefox. I've run the tests twice.
Since this is a test-only change, and it only involves changing the playFor from 2 to 5, I'm merging it without review.