wpt: Fix browser class reference

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>

Author: TimvdLippe

tools/wpt/run.py

@@ -725,7 +725,7 @@ def setup_kwargs(self, kwargs):
 
 class ServoLegacy(Servo):
     name = "servo_legacy"
-    browser_cls = browser.ServoLegacyBrowser
+    browser_cls = browser.ServoLegacy
 
     def install(self, channel=None):
         if self.prompt_install(self.name):