snes: Initialise dt#3408
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Fixes a bug due to uninitialised dt. The residuals calculation calls the RHS function with time `simtime + dt`, so occasionally the time would be large values (e.g. 1e200). This would crash `hermes-3` if `upstream_density_feedback` was being used, because the integration of the error would blow up.
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Fixes a bug due to uninitialised dt. The residuals calculation calls the RHS function with time
simtime + dt, so occasionally the time would be large values (e.g. 1e200). This would crashhermes-3ifupstream_density_feedbackwas being used, because the integration of the error would blow up.