Fix order conflict in postgres specs for default scoped models

Resolved a `PG::InvalidColumnReference` error in postgres for 
controllers interfacing with models including the
`Spree::NamedType` concern.
This concern's default scope, which orders records by the
lowercased `name`, conflicted with `SELECT DISTINCT` queries.
Controllers now adhere to this default ordering, avoiding explicit 
reordering and the associated errors.

admin/app/controllers/solidus_admin/refund_reasons_controller.rb

@@ -6,7 +6,7 @@ class RefundReasonsController < SolidusAdmin::BaseController
 
  def index
  refund_reasons = apply_search_to(
- Spree::RefundReason.order(id: :desc),
+ Spree::RefundReason.all,
  param: :q,
  )
 

admin/app/controllers/solidus_admin/reimbursement_types_controller.rb

@@ -6,7 +6,7 @@ class ReimbursementTypesController < SolidusAdmin::BaseController
 
  def index
  reimbursement_types = apply_search_to(
- Spree::ReimbursementType.order(id: :desc),
+ Spree::ReimbursementType.all,
  param: :q,
  )
 

admin/app/controllers/solidus_admin/return_reasons_controller.rb

@@ -6,7 +6,7 @@ class ReturnReasonsController < SolidusAdmin::BaseController
 
  def index
  return_reasons = apply_search_to(
- Spree::ReturnReason.order(id: :desc),
+ Spree::ReturnReason.all,
  param: :q,
  )
 

admin/app/controllers/solidus_admin/store_credit_reasons_controller.rb

@@ -6,7 +6,7 @@ class StoreCreditReasonsController < SolidusAdmin::BaseController
 
  def index
  store_credit_reasons = apply_search_to(
- Spree::StoreCreditReason.order(id: :desc),
+ Spree::StoreCreditReason.all,
  param: :q,
  )