Fix watcher.put_watcher API

[pquentin]

(One test is still failing.)

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
watcher.ack_watch	🟢	1/1	1/1
watcher.activate_watch	🟢	1/1	1/1
watcher.deactivate_watch	🟢	1/1	1/1
watcher.delete_watch	🟢	2/2	2/2
watcher.execute_watch	🟢	7/7	7/7
watcher.get_settings	🟠	Missing type	Missing type
watcher.get_watch	🟢	9/9	9/9
watcher.put_watch	🔴	37/38	38/38
watcher.query_watches	⚪	Missing test	Missing test
watcher.start	🟢	1/1	1/1
watcher.stats	🟢	1/1	1/1
watcher.stop	🟢	1/1	1/1
watcher.update_settings	🟠	Missing type	Missing type

You can validate these APIs yourself by using the make validate target.