Add sentence about cancel deadline being in the past to member waiting list notification

Merged Sébastiaan Versteeg requested to merge fix/member-waitinglist-mail into master

Closes #799 (closed)

Previous behaviour

Steps to reproduce:

  1. Put 1 user on mailing list and 1 in registration with reg limit 1
  2. Unregister the registered user via the frontend.
  3. Get email

New behaviour

Steps to validate that it works:

  1. Put 1 user on mailing list and 1 in registration with reg limit 1
  2. Unregister the registered user via the frontend.
  3. Get email

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