postfix::sender: Remove an unneeded variable definition.

manifests/postfix/sender.pp

@@ -20,7 +20,6 @@ define base::postfix::sender(
   $ensure,
   $file = '/etc/postfix/senders'
 ) {
-  $pattern = "'^${name}'"
   $line = "${name} ${ensure}"
   $file_line_ensure = $ensure ? {
     'absent' => 'absent',