oops, reversed the logic in the sites checking code

i'm rusty.

See: #441810

platform/provision_drupal.drush.inc

@@ -318,7 +318,7 @@ function provision_drupal_find_sites() {
   if ($dir = opendir("./sites")) {
     while (FALSE !== ($subdir = readdir($dir))) {
       // skip internal directory pointers
-      if ($subdir == '.' || $subdir == '..') {
+      if ($subdir != '.' && $subdir != '..') {
         $file = "./sites/$subdir/settings.php";
         if (file_exists("$file") && ($subdir != 'default') && !is_link("./sites/$subdir")) {
           $sites[$subdir] = $file;