Fix Field3D::setBoundaryTo for FCI methods #4285

Job	Run time
Fedora	19m 45s
CMake, PETSc unreleased, ADIOS2	26m 59s
Default options, Ubuntu 22.04	14m 26s
Optimised, static	16m 33s
Debug, shared	22m 7s
Shared, release	13m 52s
CUDA	12m 11s
Shared, OpenMP, 3D metrics	15m 18s
CMake, new PETSc	20m 36s
	2h 41m 47s

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