Disable groupcloned.com_test_list-images page from key_mobile_sites

The mean_input_event_latency result of groupcloned.com_test_list-images
is not correct and is adding too much noise to the metric over the page set.
We want to exclude its mean_input_event_latency from the test result
which is pending the telemetry feature of page result filter. So for now,
lets disable the this page.

BUG=409086

Review URL: https://codereview.chromium.org/616513003

Cr-Commit-Position: refs/heads/master@{#297310}

tools/perf/page_sets/key_mobile_sites.py

@@ -490,7 +490,9 @@ class KeyMobileSitesPageSet(page_set_module.PageSet):
     self.AddPage(Page19(self))
     self.AddPage(Page20(self))
     self.AddPage(Page21(self))
-    self.AddPage(Page22(self))
+#    mean_input_event_latency cannot be tracked correctly for Page22.
+#    See crbug.com/409086.
+#    self.AddPage(Page22(self))
 #    self.AddPage(Page23(self))
     self.AddPage(Page24(self))
     self.AddPage(Page25(self))