Clean up down migration

Author: mattdailis

deployment/hasura/migrations/Aerie/14_sequence_templates/down.sql

@@ -1,7 +1,5 @@
-drop table sequencing.expanded_templates cascade;
-drop table sequencing.sequence_filter cascade;
-drop trigger ensure_language_match on sequencing.sequence_template;
-drop function sequencing.check_language_sameness cascade;
-drop table sequencing.sequence_template cascade;
+drop table sequencing.expanded_templates;
+drop table sequencing.sequence_filter;
+drop table sequencing.sequence_template;
 
 call migrations.mark_migration_rolled_back('14');