Fixed tests

refs TryGhost@85cce39

- removed out of date transfer owner modal integration test
- fixed missing `?` in optional chaining in `<GhImageUploader>` error handling

Author: kevinansfield

ghost/admin/app/components/gh-image-uploader.js

@@ -248,7 +248,7 @@ export default Component.extend({
             message = `The image type you uploaded is not supported. Please use ${validExtensions}`;
         } else if (isRequestEntityTooLargeError(error)) {
             message = 'The image you uploaded was larger than the maximum file size your server allows.';
-        } else if (!isBlank(error.payload?.errors[0]?.message)) {
+        } else if (!isBlank(error.payload?.errors?.[0]?.message)) {
             message = error.payload.errors[0].message;
         } else {
             message = 'Something went wrong :(';