Fix a bug and a magic number in module_exx_symmetry (#5848) #324

Job	Run time
Build with GNU toolchain	8m 11s
Build with Intel toolchain	7m 11s
Build extra components with GNU toolchain	19m 21s
Build extra components with Intel toolchain	16m 13s
Build with CUDA support	16m 7s
Build without LCAO	5m 3s
Build without ELPA	8m 2s
Build without MPI	6m 22s
Build without LCAO and MPI	3m 59s
	1h 30m 29s

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