Fix file name of start page test

phpcs-errors:1646 phpunit-status:successful

tests/startPageTest.php

@@ -10,11 +10,10 @@
 
 use PHPUnit\Framework\TestCase;
 
-final class StartPageLoadsTest extends TestCase {
+final class StartPageTest extends TestCase {
 
     public function testHTMLOutput():void {
 
-        ob_start();
         include __DIR__ . "/../index.php";
         $output = $this->getActualOutput();