Fix authorized overdraft input field.

src/accounts/account.form.tmpl.html

@@ -41,7 +41,8 @@
           <div class="input-group-addon">-</div>
           <input class="form-control" id="authorized-overdraft"
           name="authorized_overdraft"
-          ng-model="$ctrl.account.authorized_overdraft"
+          ng-model="$ctrl.authorized_overdraft"
+          ng-change="$ctrl.authorizedOverdraftChange()"
           type="number" placeholder="Authorized overdraft"
           required min="0"/>
           <div class="input-group-addon">.00€</div>