Livetable results still allow reconstructing password hashes using 768 requests

Steps to reproduce:

Open /xwiki/bin/get/XWiki/LiveTableResults?outputSyntax=plain&password_class=XWiki.XWikiUsers&collist=password&password=hash:SHA-512:c

Modify the filter as explained in XWIKI-19949 to recover the full password hash.

Expected result:

Results aren't filtered by the password column, so all documents are returned.

Actual result:

The filter is applied as the check added for fixing XWIKI-19949 doesn't consider the class passed via the _class parameters.

I've indicated the same affects version as XWIKI-19949.