Toolbar Oldest files delete bug

[byazrail]

system/Debug/Toolbar format function;

		// Oldest files will be deleted
		if ($app->toolbarMaxHistory >= 0 && $i >= $app->toolbarMaxHistory)
		{
			Services::cache()->delete($filenames[$i]);
			continue;
		}

fixed;

		// Oldest files will be deleted
		if ($app->toolbarMaxHistory >= 0 && ($i + 1) >= $app->toolbarMaxHistory)
		{
			Services::cache()->delete($filenames[$i]);
			continue;
		}

Count and file $i start 0.

[samsonasik]

@byazrail I've created PR #1155 for it.