LPS-37463 Display right count in portlet export and publish

Hey Zsolt,

After reviewing your changes with @juliocamarero, we think it'd be simplier to optionally pass the portletPreferences parameter to the prepareManifestSummary method. Only the portlets exporting data based on their preferences would use this parameter. The reported bug affects not only to Web Content Display and Wiki Display, but also to RSS portlet (where you can select one header and one footer Web contents) and to the Polls Display portlet.

I've applied our changes to the JournalContentPortletDataHandler and to the JSPs (export and also publish portlet). Could you please validate and apply this pattern to the PDHs of the rest of the above mentioned portlets?

Thanks!