Bug 22757: Add CodeMirror highlighting on more YAML formatted preferences

Bug 22757: Add CodeMirror highlighting on more YAML formatted preferences

Test plan:
Go to system preferences and ensure the code highlighting is used on
these preferences:
    UpdateNotForLoanStatusOnCheckin
    BibtexExportAdditionalFields
    RisExportAdditionalFields
    UpdateItemWhenLostFromHoldList
    MarcFieldsToOrder
    MarcItemFieldsToOrder
    ItemsDeniedRenewal

Signed-off-by: Owen Leonard <oleonard@myacpl.org>

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>