Removed whitespaces in blank line

Author: rumpfc

tests/system/Debug/TimerTest.php

@@ -138,7 +138,7 @@ public function testRecordFunctionWithReturn()
         $timer       = new Timer();
         $returnValue = $timer->record('longjohn', static function () {
             usleep(100000);
-            
+
             return 'test';
         });