Removed unused code from stripe-connect modal

no issue

- hangover from a copy/paste when re-arranging screens

ghost/admin/app/components/modal-stripe-connect.hbs

@@ -10,7 +10,6 @@
 <form>
 <div class="modal-body">
     <GhMembersPaymentsSetting
-        @setDefaultContentVisibility={{this.setDefaultContentVisibility}}
         @setStripeConnectIntegrationTokenSetting={{this.setStripeConnectIntegrationTokenSetting}}
     />
 </div>

ghost/admin/app/components/modal-stripe-connect.js

@@ -8,11 +8,6 @@ import {inject as service} from '@ember/service';
 export default class ModalStripeConnect extends ModalBase {
     @service settings;
 
-    @action
-    setDefaultContentVisibility(value) {
-        this.settings.set('defaultContentVisibility', value);
-    }
-
     @action
     setStripeConnectIntegrationTokenSetting(stripeConnectIntegrationToken) {
         this.settings.set('stripeConnectIntegrationToken', stripeConnectIntegrationToken);