Update ldap.rb to allow LDAP and not LDAPS access

The code was failing because 
```
vendor/gems/ruby/3.1.0/gems/net-ldap-0.17.1/lib/net/ldap/connection.rb:72:in `open_connection': unsupported encryption method  (Net::LDAP::Error)
```
The "nil" encryption method doesn't exist, to not use encryption, we can just omit the `encryption` parameter

lib/entitlements/service/ldap.rb

@@ -239,8 +239,6 @@ module Entitlements
                 verify_mode: @disable_ssl_verification ? OpenSSL::SSL::VERIFY_NONE : OpenSSL::SSL::VERIFY_PEER
               }
             }
-          else
-            ldap_options[:encryption] = { method: nil }
           end
 
           if @ca_file && ldap_options[:encryption].key?(:tls_options)