Encryption Required in /printers location not checked

[cyberbix]

if CUPS is set to secure printing only, airpint-generate should write ipps instead of ipp mDNS-Records.

Otherwise printing brings an error

<Location /printers> Encryption Required </Location>

should lead to ipps resource records.

Correct behaviour has been tested with current versions of IOS and macOS. Unfortunately, several Android print services (i.e. CUPS for Android) do not work with ipps records