Fix streamhost default logging

Current default values will cause Nginx to fail to start if nginx::stream is true.

http://nginx.org/en/docs/stream/ngx_stream_log_module.html#access_log
Format must be defined, which current default configuration doesn't do.
Nginx default is "off", and therefore the module default should be "off" as well.

manifests/init.pp

@@ -65,7 +65,7 @@
   Stdlib::Filemode $log_mode                                 = $nginx::params::log_mode,
   Variant[String, Array[String]] $http_access_log            = "${log_dir}/access.log",
   Optional[String] $http_format_log                          = undef,
-  Variant[String, Array[String]] $stream_access_log          = "${log_dir}/stream-access.log",
+  Variant[String, Array[String]] $stream_access_log          = 'off',
   Optional[String] $stream_custom_format_log                 = undef,
   Variant[String, Array[String]] $nginx_error_log            = "${log_dir}/error.log",
   Nginx::ErrorLogSeverity $nginx_error_log_severity          = 'error',