Add whitespace to make test pass

(Thanks to PHPStorm for trimming it pre-commit)

Author: pierlon

assets/src/block-validation/components/validation-error-message/test/__snapshots__/index.js.snap

@@ -11,7 +11,7 @@ Array [
 
 exports[`ValidationErrorMessage renders an error with a title 1`] = `
 <span>
-  Invalid attribute
+  Invalid attribute 
   <code>
     onclick
   </code>