CPaster: Fix fetching list of pastebin.ca

Page now uses websockets internally that updates respective
content asynchronously. Initial GET of the page only fetches
an empty list - work around by using a pre-constructed json
array that is contained within the initial content.

Change-Id: Id8619450ecc758057fce23079e7eed6de8abe5dc
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>