Fixed brand settings not resetting when cancelling

no issue

- trigger modal close once save task has finished
- reset unsaved changes when closing the modal (eg, cancel button clicked)
- removed unused code that had been copied over from an old controller

ghost/admin/app/components/modal-branding.js

@@ -76,6 +76,8 @@ export default ModalComponent.extend({
 
     willDestroyElement() {
         window.removeEventListener('message', this._previewListener);
+        // reset any unsaved changes when closing
+        this.settings.rollbackAttributes();
     },
 
     actions: {
@@ -83,47 +85,6 @@ export default ModalComponent.extend({
             this.save.perform();
         },
 
-        toggleLeaveSettingsModal(transition) {
-            let leaveTransition = this.leaveSettingsTransition;
-
-            if (!transition && this.showLeaveSettingsModal) {
-                this.set('leaveSettingsTransition', null);
-                this.set('showLeaveSettingsModal', false);
-                return;
-            }
-
-            if (!leaveTransition || transition.targetName === leaveTransition.targetName) {
-                this.set('leaveSettingsTransition', transition);
-
-                // if a save is running, wait for it to finish then transition
-                if (this.save.isRunning) {
-                    return this.save.last.then(() => {
-                        transition.retry();
-                    });
-                }
-
-                // we genuinely have unsaved data, show the modal
-                this.set('showLeaveSettingsModal', true);
-            }
-        },
-
-        leaveSettings() {
-            let transition = this.leaveSettingsTransition;
-            let settings = this.settings;
-
-            if (!transition) {
-                this.notifications.showAlert('Sorry, there was an error in the application. Please let the Ghost team know what happened.', {type: 'error'});
-                return;
-            }
-
-            // roll back changes on settings props
-            settings.rollbackAttributes();
-
-            return transition.retry();
-        },
-
-        reset() {},
-
         async removeImage(image) {
             // setting `null` here will error as the server treats it as "null"
             this.settings.set(image, '');
@@ -213,7 +174,9 @@ export default ModalComponent.extend({
 
         try {
             yield RSVP.all(validationPromises);
-            return yield this.settings.save();
+            yield this.settings.save();
+            this.closeModal();
+            return true;
         } catch (error) {
             if (error) {
                 notifications.showAPIError(error);