Change Do Not SMS privacy icon

See #2754

CRM/Core/Smarty/plugins/function.privacyFlag.php

@@ -36,7 +36,7 @@ function smarty_function_privacyFlag($params, &$smarty) {
     'do_not_phone' => 'fa-phone',
     'do_not_email' => 'fa-paper-plane',
     'do_not_mail' => 'fa-envelope',
-    'do_not_sms' => 'fa-mobile',
+    'do_not_sms' => 'fa-comments-o',
     'do_not_trade' => 'fa-exchange',
     'is_opt_out' => 'fa-paper-plane-o',
   ];