updates expected UI test files

Author: sgiehl

plugins/CorePluginsAdmin/tests/UI/expected-screenshots/PluginsAdmin_plugins.png

@@ -196,7 +196,7 @@ public function processRequestParams(VisitProperties $visitProperties, Request $
                                 {
                                     BotRequestHandlingTest::$eventsTriggered['RequestProcessor'][] = 'processRequestParams';
 
-                                    return false;
+                                    return true; // abort to avoid further processing
                                 }
                             },
                         ];