Chore: Changed the account_type and voucher_type enum.

The account type enum is not stored in the database as an enum.
The voucher_type enum is now a table in the database.

Feature: Closing stock can now be saved and in each department.

overlord/src/app/core/voucher.service.ts

@@ -71,7 +71,7 @@ export class VoucherService {
   }
 
   saveOrUpdate(voucher: Voucher): Observable<Voucher> {
-    const endpoint = voucher.type.replace(/ /g, '-').toLowerCase();
+    const endpoint = voucher.type.replace(/_/g, '-').toLowerCase();
     if (!voucher.id) {
       return this.save(voucher, endpoint);
     }