Duplicated FGDC overview element from metadata edit

[mattblanchette]

When an FGDC overview element (Overview Description) is added on the Advanced view metadata edit form with the + button, two elements are actually added.

If one of the overview elements is attempted to be removed with the x button, the number of overview elements increases instead to 6.

The number of overview elements also doubles simply by opening a metadata entry for editing or when switching between XML and form editing views.

[mattblanchette]

eainfo is a choice element
With either a sequence or an element in the dropdown
Selecting the sequence works, but selecting the element (overview, named "Overview Description" in dropdown) will add both the sequence and the element.

 <eainfo>
    <eainfoTypeSEQUENCE_ELEMENT0>
      <overview>
        <eaover />
        <eadetcit />
      </overview>
    </eainfoTypeSEQUENCE_ELEMENT0>
    <overview>
      <eaover />
      <eadetcit />
    </overview>
  </eainfo>