Negative control outcomes generation bug

[anthonysena]

If you generate negative control outcomes more than one time and your cohort_definition_id is not the same as the outcome concept ID, you can produce duplicates in the cohort table due to the improper removal of prior results per this code here:

CohortGenerator/inst/sql/sql_server/NegativeControlOutcomes.sql

Lines 30 to 35 in dc3bde3

	DELETE FROM @cohort_database_schema.@cohort_table
	WHERE cohort_definition_id IN (
	SELECT DISTINCT ancestor_concept_id
	FROM #Codesets
	)
	;

This should be:

 DELETE FROM @cohort_database_schema.@cohort_table 
 WHERE cohort_definition_id IN ( 
   SELECT DISTINCT cohort_definition_id
    FROM #Codesets
 )