Small fix

Author: matthewlipski

tests/src/unit/core/clipboard/copy/__snapshots__/text/html/mentionWithBackgroundColor.html

@@ -5,6 +5,7 @@
     data-external="true"
     data-inline-content-type="mention"
     data-user="User"
+    style="background-color: red;"
   >@User</span>
 </p>
 <p>Paragraph 2</p>