Remove the useless #for_display proxy method

app/models/champs/linked_drop_down_list_champ.rb

@@ -29,10 +29,6 @@ class Champs::LinkedDropDownListChamp < Champ
     :primary_value
   end
 
-  def for_display
-    string_value
-  end
-
   def mandatory_and_blank?
     mandatory? && (primary_value.blank? || secondary_value.blank?)
   end

app/views/shared/dossiers/_champs.html.haml

@@ -19,7 +19,7 @@
         - when TypeDeChamp.type_champs.fetch(:linked_drop_down_list)
           %th.libelle
             = "#{c.libelle} :"
-          %td= c.for_display
+          %td= c
         - when TypeDeChamp.type_champs.fetch(:dossier_link)
           %th.libelle
             = "#{c.libelle} :"

spec/models/champs/linked_drop_down_list_champ_spec.rb

@@ -16,12 +16,12 @@ describe Champs::LinkedDropDownListChamp do
     it { expect(champ.value).to eq('["tata","tutu"]') }
   end
 
-  describe '#for_display' do
+  describe '#to_s' do
     let(:champ) { described_class.new(primary_value: primary_value, secondary_value: secondary_value) }
     let(:primary_value) { nil }
     let(:secondary_value) { nil }
 
-    subject { champ.for_display }
+    subject { champ.to_s }
 
     context 'with no value' do
       it { is_expected.to eq('') }