LP#1858138: remove remaining uses of showLinkSelector

LP#1858138: remove remaining uses of showLinkSelector

Now that showLinkSelector is deprecated and does nothing,
remove current uses of it.

To test
-------
[1] Apply the patch.
[2] Visit Angular admin interfaces that have grids that
    refer to linked IDL classes, e.g.,

    - Local Admin -> Carousels (carousel type)
    - Server Admin -> Weights Association (circ weights and hold
                                           weights)
    - Local Admin -> Item Tags (copy tag type)
    - Acq Admin -> EDI Accounts (provider)

[3] Verify that the columns for linked fields display the
    appropriate selector field rather than the numeric ID.

Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>