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.