Revert "Increased htmlCacheUpdate throttle"

Not really needed since the problem was just stuck/absent runners.

This reverts commit 1d5ee5999b30ba11837beed6f483d22f27837300.

Change-Id: I705bf868a2fc4cdbb6e66cd97708ee2526468e83
Merge "Revert "Increased htmlCacheUpdate throttle""