MT#5879 Rename invoice template tables with s sufficses.

db_scripts/diff/15052.down

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+use billing;
+
+alter table invoice_templates rename to invoice_template;
+alter table invoice_template_resources rename to invoice_template_resource;

db_scripts/diff/15052.up

@@ -0,0 +1,4 @@
+use billing;
+
+alter table invoice_template rename to invoice_templates;
+alter table invoice_template_resource rename to invoice_template_resources;