Updated a reference to a class which was renamed (JobStats -> CalcStats)
Updated a reference to a class which was renamed (JobStats -> CalcStats)


Former-commit-id: df8cfea6af0932c9bacf918a05a82fff8121c219
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine