LPS-34188 Fix content export options

Hey Nate,

In one of the source formattings we lost one of the features of the new export dialog. Under the content panel, for every portlet the "Change" link should display a dialog with the specific options for that portlet. If you test it with the current version, you only get the dialog with the options for the portlet you click the first time...

I've performed some changes to get the expected behaviour, though of course there might be a better way of doing it. But the result must be the same: the dialog for each portlet must contain the options for that specific portlet and if the dialog is reopened, the previously checked/unchecked options for that portlet must be there. This way, when sending the form the request contains all the selected options for every portlet.

Can you have a look at this?

Thank you very much!

@ipeychev
@juliocamarero
@LeventeHudak