Removed pre_calculator in classical_risk and classical_damage [skip hazardlib][demos]
Removed pre_calculator in classical_risk and classical_damage [skip hazardlib][demos]


Former-commit-id: 1b08702cc4ec1419edfe508cb85d9270035f7fbf [formerly 74ee1ddd55deb67a5d624e06a01465123a9fb598]
Former-commit-id: ac0fd3bdd8f4aa687512f5de60b15b6a844d6336
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine