Specifying http protocol when getting Open Sans font to fix Scripting API

Summary: Object QWebView, inside Scripting API, was not displaying any text. Specifying http protocol when getting Open Sans font fixes this problem and then the text is displayed properly.

Reviewers: tcanabrava

Reviewed By: tcanabrava

Subscribers: pino, kde-edu

Tags: KDE Edu

Differential Revision: https://phabricator.kde.org/D16164