fix: fix evaluate_base_model flag #142

Job	Run time
collab-check	5s
wait-for-approval	4s
detect-changes	10s
integ-tests (sagemaker-core)	9m 12s
unit-tests (sagemaker-train)	29m 20s
codestyle-doc-tests (sagemaker-train)	6m 46s
codestyle-doc-tests (sagemaker-core)	31m 2s
integ-tests (sagemaker-train)	51m 57s
unit-tests (sagemaker-core)	1h 3m 41s
	3h 12m 17s

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