progress-events: change the file constructor.html to that of the approve...

...d file.

The file was copied from:
https://dvcs.w3.org/hg/webapps/file/01bd97d7d635/ProgressEvents/tests/submissions/Ms2ger/constructor.html

This commit changes it to:
https://dvcs.w3.org/hg/webapps/file/01bd97d7d635/ProgressEvents/tests/approved/constructor.html