AssignColorsView: fix pqPalletChooser behavior on apply.
Paraview's pqPalletChooser has a weird semi-modal behavior where it disables interaction with the UI except for the render view, when it is open. Instead of destroying/recreating the dialog, call close() so it properly cleans up the event filter that causes this behavior. Makes the dialog testable using the recorded xml tests. add a few more UI names.
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