Malformed XML in React/latest ui.content

[actinium15]

Fixes #25

Removes the linefeed that breaks XML compilance

Motivation and Context

It isn't possible to install the ui.content artifact built from React/latest branch on AEM. Since this is an ~year old change (from Aug '20), it is likely to exist in other branches as well, but I haven't gone down that path.

How Has This Been Tested?

• built the ui.content and the dependencies from the latest state of the branch; installation of artifact failed on AEM
• applied the patch, rebuilt the content-package; installation of artifact on AEM succeeded.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• ~[ ] New feature (non-breaking change which adds functionality)~
• ~[ ] Breaking change (fix or feature that would cause existing functionality to change)~

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• ~[ ] My change requires a change to the documentation.~
• ~[ ] I have updated the documentation accordingly.~
• [x] I have read the CONTRIBUTING document.
• ~[ ] I have added tests to cover my changes.~
• [x] All new and existing tests passed.

[actinium15]

@godanny86, for your consideration (can't add you as a reviewer)