Update model.rb - Throw 'UnknownDnsResourceError'

Throw `UnknownDnsResourceError` instead of `InvalidDnsResourceError`

Prevents `[20:30:55][!] Internal error while adding DNS rule (uninitialized constant BeEF::Core::Models::Dns::Rule::InvalidDnsResourceError)` for invalid user supplied DNS response types.

'BeEF::Core::Models::Dns::Rule::InvalidDnsResourceError' does not exist, and it's unlikely we'll need to differentiate between invalid and unknown resource types.

extensions/dns/model.rb

@@ -25,7 +25,7 @@ module BeEF
             begin
               validate_pattern(rule.pattern)
               rule.callback = format_callback(rule.resource, rule.response)
-            rescue InvalidDnsPatternError, InvalidDnsResourceError, InvalidDnsResponseError => e
+            rescue InvalidDnsPatternError, UnknownDnsResourceError, InvalidDnsResponseError => e
               print_error e.message
               throw :halt
             end