fix WikiWCache::checkArguments() (v 1.5.1) required PhpTags 3.8.0

* use Runtime::disableParserCache() in WikiWCache::s_disableCache()

Change-Id: Ieadd3e128f6eb3a2ba98255c888cb9a10d4755ff
(cherry picked from commit fcad69e469817570536ba5c2649d27f90b016554)