Move default value in account constructor.

src/accounts/account.controller.ts

@@ -58,13 +58,7 @@ export class AccountController {
      * Add an empty account.
      */
     add() {
-        var account = new Account({
+        return this.modify(new Account());
-            // eslint-disable-next-line camelcase
-            authorized_overdraft: 0
-        });
-
-        // Insert account at the begining of the array.
-        return this.modify(account);
     };
 
     /*

src/accounts/account.ts

@@ -8,4 +8,8 @@ export class Account {
   authorized_overdraft: number;
 
   balances: AccountBalances;
+
+  constructor() {
+    this.authorized_overdraft = 0;
+  }
 }