Add extra 'drop constraint' clause to match with prod schema constraint name

Author: KarlLevik

schemas/ispyb/updates/2024_01_04_drop_unused_tables.sql

@@ -21,6 +21,7 @@ DROP TABLE IF EXISTS WorkflowMesh;
 
 ALTER TABLE DataCollectionGroup
   DROP CONSTRAINT IF EXISTS DataCollectionGroup_ibfk_3,
+  DROP CONSTRAINT IF EXISTS _DataCollectionGroup_ibfk_3,
   DROP COLUMN IF EXISTS workflowId;
 DROP TABLE IF EXISTS Workflow;