Reset output `Options` after writing to disk #4148

Job	Run time
CUDA	11m 32s
Fedora	1m 23s
CMake, PETSc unreleased, ADIOS2	9m 45s
Default options, Ubuntu 20.04	8m 20s
Optimised, static	8m 18s
Debug, shared	10m 36s
Shared, release, Ubuntu 20.04	4m 16s
Shared, OpenMP, 3D metrics	7m 40s
CMake, new PETSc	11m 35s
	1h 13m 25s

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