Fix typo in is_master fact

Author: h-haaks

lib/facter/is_master.rb

@@ -18,7 +18,7 @@ def get_options_from_hash_config(config)
 
   result << "--port #{port}" unless port.nil?
   result << '--ipv6' if ipv6
-  unless tls_mode.nil? || tls_mode == 'diabled'
+  unless tls_mode.nil? || tls_mode == 'disabled'
     result << "--tls --host #{Facter.value(:fqdn)}"
     result << "--tlsCertificateKeyFile #{tls_cert_key}" unless tls_cert_key.nil?
     result << "--tlsCAFile #{tls_ca}" unless tls_ca.nil?