refactor: debugbar time header not dependent on locale

Author: michalsn

system/Debug/Toolbar.php

@@ -397,7 +397,7 @@ public function prepare(?RequestInterface $request = null, ?ResponseInterface $r
             helper('filesystem');
 
             // Updated to microtime() so we can get history
-            $time = sprintf('%.6f', Time::now()->format('U.u'));
+            $time = Time::now()->format('U.u');
 
             if (! is_dir(WRITEPATH . 'debugbar')) {
                 mkdir(WRITEPATH . 'debugbar', 0777);