Fix replication issue.

Another stupid mysql thing where you explicitely have to "USE"
a db for replication to work.

db_scripts/diff/13226.down

@@ -1,3 +1,5 @@
+USE billing;
+
 DROP TRIGGER billing.bill_fees_crepl_trig;
 DROP TRIGGER billing.bill_fees_urepl_trig;
 

db_scripts/diff/13226.up

@@ -1,3 +1,5 @@
+USE billing;
+
 ALTER TABLE billing.billing_fees
   ADD COLUMN source VARCHAR(255) NOT NULL DEFAULT '.' 
   AFTER billing_zone_id;