Try to fix flaky test

tests/Browser/Contacts/Contacts.php

@@ -56,9 +56,10 @@ class Contacts extends \Tests\Browser\TestCase
                 $browser->assertToolbarMenu(['select'], []);
             }
             else if ($browser->isTablet()) {
-                $browser->click('.toolbar-list-button');
+                $browser->click('.toolbar-list-button')
-                $browser->assertVisible('#toolbar-list-menu a.select:not(.disabled)');
+                    ->waitFor('#toolbar-list-menu')
-                $browser->click();
+                    ->assertVisible('#toolbar-list-menu a.select:not(.disabled)')
+                    ->click();
             }
             else {
                 $browser->assertVisible('#toolbar-list-menu a.select:not(.disabled)');