Update sim_linelist() and sim_outbreak() snapshots

[joshwlambert]

This PR updates the snapshots for the regression unit tests (testthat::expect_snapsnot()) that had started to fail because of an update to {epiparameter}.

This PR makes no functional changes to the {simulist} package.

Since epiverse-trace/epiparameter#323 the epidist_db() function preferentially selects database entries that account for right truncation when specifying single_epidist = TRUE. This impacts the unit tests of sim_linelist() and sim_outbreak() which call epiparameter::epidist_db() to load an onset-to-hospitalisation and an onset-to-death delay distribution. Since the change to {epiparameter} different delay distributions are being returned and as a result the simulated line lists and outbreak datasets are different to the previous snapshots.