[Qt] InspectorServer: Improve the JSON page list's parameter names

[Qt] InspectorServer: Improve the JSON page list's parameter names
https://bugs.webkit.org/show_bug.cgi?id=83592

Reviewed by Simon Hausmann.

- Add "id" that would be needed to build the URL when using local front-end resources
  (and will be used by tests)
- Rename description to "title", the description contains both the title and URL on the final list
- Rename inspectorLocation to "inspectorUrl" to match with the url parameter.

* UIProcess/InspectorServer/qt/WebInspectorServerQt.cpp:
(WebKit::WebInspectorServer::buildPageList):
* qt/Resources/inspectorPageIndex.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@113860 268f45cc-cd09-0410-ab3c-d52691b4dbfc