Revert level session inventory check race condition fix
Revert level session inventory check race condition fix

Introduced a much more serious level load freeze bug when trying to fix
showing extra inventory modals here:
5e3101e52c7edfa0a8c4ade2c86731d2e6b2f85e

codecombat/codecombat,icodegame/codecombat,icodegame/codecombat,icodegame/codecombat,javatlacati/codecombat,kidaa/codecombat,codecombat/codecombat,jeremiahyan/codecombat,kidaa/codecombat,javatlacati/codecombat,kidaa/codecombat,javatlacati/codecombat,jeremiahyan/codecombat,kidaa/codecombat,javatlacati/codecombat,codecombat/codecombat,jeremiahyan/codecombat,icodegame/codecombat,codecombat/codecombat,codecombat/codecombat,jeremiahyan/codecombat,javatlacati/codecombat