fix ToEntrys in FEntrys not being considered for 'to' filtering

fix ToEntrys in FEntrys not being considered for 'to' filtering

When a 'to' filter is specified and a mail has multiple 'to's with at
least one being accepted, the others blocked or quarantined and the
'to' for the accepted mail does not match, the entries in the filter
will be ignored even if one of them would match.
To fix it the filter ToEntrys are now considered in the 'to' check.

Signed-off-by: Mira Limbeck <m.limbeck@proxmox.com>