Fixes jQuery loading script tag

[shamanime]

Added missing http: to the jQuery script tag

[blueimp]

Why is the protocol ("http:") missing from the script references in the HTML source code?

This is called a protocol relative url and a perfectly valid way to define a resource, relative to the current URL protocol.
This ensures that the referenced scripts are loaded via the same protocol as the current page, which avoids security notifications when loading resources via unencrypted HTTP on a page loaded via HTTPS.

However, it also requires that the current protocol is either "http:" or "https:" and will not work on a "file:" url.

https://github.com/blueimp/jQuery-File-Upload/wiki/Frequently-Asked-Questions