Correction of false exception message in startup check

The exception message states the lowest possible presenter class where method beforeRender is found, so the error can be here or in its parents not descendants !!

src/Application/UI/Presenter.php

@@ -189,7 +189,7 @@ public function run(Application\Request $request): Application\Response
 			$this->startup();
 			if (!$this->startupCheck) {
 				$class = static::getReflection()->getMethod('startup')->getDeclaringClass()->getName();
-				throw new Nette\InvalidStateException("Method $class::startup() or its descendant doesn't call parent::startup().");
+				throw new Nette\InvalidStateException("Method $class::startup() or its parents doesn't call parent::startup().");
 			}
 
 			// calls $this->action<Action>()