sqlite3 - remove the WITH statement for db conn

adcern/sqlite3_backend.py

@@ -49,4 +49,4 @@ def modify_db(conn,
             break
         # max attempts achieved, quit            
         if x == upperbound - 1:
-            raise Exception("Sqlite3 - achieved max retries to commit with no success, giving up...")
+            raise Exception("Sqlite3 - achieved max retries to commit with no success, giving up...")
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