Issue with sites using SSL

Hello,

First, thank you very much for putting the love and effort into this plugin. My entire site uses SSL and considering this is a login plugin, I feel it is important to let you know that sites with SSL have an issue loading the fonts. In the file login-form-screen.php, the reference to http://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js specifies HTTP. This needs to be //ajax.googleapis.com/ajax/libs/webfont/1/webfont.js so that it will use HTTP or HTTPS.

I modified the file for myself and it works perfectly, but might be good to update for others and future deployments.

Great plugin otherwise.

https://ww.wp.xz.cn/plugins/admin-custom-login/