Wrong permission for network admin settings page.

Hi,

In the file class.wppp-admin.php on line 91 you add the settings page with the manage_options permission. The correct permission in the network admin context would be manage_network_options.

In my case I give specific users access to only certain areas of the network admin. However the manage_options permission is checked in the context of the main blog. So if a user is administrator of the main blog, but not a super admin and does not have the manage_network_options permission he can still access the Performance Pack settings.

https://ww.wp.xz.cn/plugins/wp-performance-pack/