fix(estimation): correct the participant_num assignment logic for est… #1077

Job	Run time
linux-64-py	5m 49s
Standard 2-Zone Example (SANDAG)	1h 36m 52s
Expression Profiling Tests	7m 23s
win-64	8m 6s
Standard 1-Zone Example (MTC)	56m 22s
estimation_edb_creation_test	6m 37s
develop-docbuild	2m 55s
macOS	6m 40s
random_seed_generation_test	3m 13s
Estimation Mode Unit Tests	25m 50s
Estimation Notebooks Test	51m 39s
placeholder_psrc	56m 21s
prototype_mtc	57m 54s
prototype_marin	1m 40s
prototype_mtc_extended	1h 27m 27s
production_semcog	6m 40s
prototype_sandag_xborder	6m 15s
prototype_mwcog	1h 4m 15s
placeholder_multiple_zone	10m 26s
	9h 22m 24s

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