JumpToPage feature does not work in path-based multiwiki

The URL for the REST service, which should contain the name of the wiki in it, is generated inside the JS file, based on the wiki corresponding to the URL of the JS file. But in a path-based multiwiki, there's only one URL for the JS file, which doesn't take into account virtual wikis. The solution would be to construct the correct URL on the client, based on the "current wiki" information in the document META.