Protect against use_post_step_regrid when not subcycling #2639
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PR summary
The castro.use_post_step_regrid parameter doesn't make sense when we're not subcycling. By the time we finish the coarse step we will already have finished all of the fine timesteps (thanks to the recent change in #2505), so there's nothing left to do.
PR checklist
CHANGES
file has been updated, if appropriate