We rename data-bot-owner-id and data-owner-id, used to open user
profile of bot owners, to data-user-id such that we can make a
global click handler for all of them by making a separate class
in next commit.
We now prevent these variations:
* <hr/>
* <hr />
* <br/>
* <br />
We could enforce similar consistency for other void
tags, if we wished, but these two are particularly
prevalent.