MT#5879 Clean up code and db from invoice templates active flag.

db_scripts/diff/15091.down

@@ -0,0 +1,2 @@
+USE billing;
+alter table invoice_templates add column is_active boolean not null default 0;

db_scripts/diff/15091.up

@@ -0,0 +1,2 @@
+USE billing;
+alter table invoice_templates drop column is_active;