break if a matching trusted host is found

fix for https://github.com/yiisoft/yii2/pull/13780#discussion_r134186910
thanks to @krukru !

PR #13780

framework/web/Request.php

@@ -292,7 +292,7 @@ class Request extends \yii\base\Request
                 }
                 if (preg_match($hostRegex, $host) || preg_match($hostRegex, $ip)) {
                     $trustedHeaders = $headers;
-                    continue;
+                    break;
                 }
             }
         }