Regenerate golden files for all tests affected by timestep timing fix

The mytime update now happens after RK stepping instead of before,
which fixes the last-timestep RHS being skipped for cfl_dt tests.
This affects QBMM, Lagrange bubbles, body forces, cylindrical,
and example tests that use cfl_dt/cfl_adap_dt.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sbryngelson