Refactor: Simplify Center2_Orb::init_Lmax() #157

Job	Run time
Build without LCAO	5m 11s
Build extra components with GNU toolchain	22m 13s
Build with Intel toolchain	7m 51s
Build without MPI	6m 59s
Build with GNU toolchain	8m 58s
Build without ELPA	8m 37s
Build extra components with Intel toolchain	17m 8s
Build with CUDA support	15m 0s
Build without LCAO and MPI	4m 27s
	1h 36m 24s

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