Skip nesting coefficient evaluation when evaluating logsums using MNL… #829

Job	Run time
linux-64-py3.10	6m 32s
macOS	5m 42s
develop-docbuild	4m 19s
win-64	2m 49s
prototype_mtc	50m 2s
estimation_mode_test	16m 47s
placeholder_psrc	42m 47s
Standard 1-Zone Example (MTC)	51m 57s
random_seed_generation_test	3m 9s
prototype_marin	3m 2s
Standard 2-Zone Example (SANDAG)	1h 9m 42s
prototype_mtc_extended	1h 28m 59s
placeholder_sandag	1h 45m 37s
prototype_sandag_xborder	5m 7s
production_semcog	5m 54s
prototype_mwcog	49m 23s
placeholder_multiple_zone	9m 27s
	8h 41m 15s

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