kWidget: update window.kalturaJQuery reference & pass jQuery to closure

* We need to pass two vars to our onPage plugin closure to populate both
$ and jQuery
* We should always populate window.kalturaJQuery even if jQuery is valid
on the page for us already ( in case any plugin adds a dependency to
that var
KWidget follow up to 9402d07091803491a162a413b291ba4f20f89ba0 fix jQuery
method call where already defined.
bumped version to v1.8.8.1