ability to transfer points anonymously was inadvertently(?) removed

[kareila]

We pointed out in #2435 that allowing users to anonymously transfer points was a workaround for not allowing them to anonymously gift points; however, the line in the form that printed the checkbox is no longer in evidence, and appears to have been removed in #3214, although I believe the controller still contains the code to process the checkbox if the form contains it.

Reported here: https://www.dreamwidth.org/support/see_request?id=50131

Original form HTML (will need to be translated from table row to Foundation row):
<tr><td></td><td><input type='checkbox' name='anon' id='anon'> <label for='anon'>[% '.anon' | ml %]</label></td></tr>