Fix content view widget quick filter popup

The default content view filter popup is embedded directly in the page template.
When defining tabs showing a content view from Studio, the content view is wrapped in a container: the filter popup does not open properly on these because the re-render does not find the target component (their id is prefixed).

Replacing f:ajax tags by a4j:ajax tags allow working around this component resolution bug: the tag from richfaces library resolves local component first.