Fix directory check in sitePath method

Using is_dir() on a parent directory can trigger errors when PHP does not have permission to access it, which can happen when open_basedir is used.

Author: andreasnij

cli/Valet/Server.php

@@ -173,7 +173,7 @@ public function sitePath(string $siteName): ?string
             $dirs = [];
 
             while (($file = readdir($handle)) !== false) {
-                if (is_dir($path.'/'.$file) && ! in_array($file, ['.', '..'])) {
+                if (! in_array($file, ['.', '..']) && is_dir($path.'/'.$file)) {
                     $dirs[] = $file;
                 }
             }