chore: enable freeze string literals by comment

app/controllers/champs/carte_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Champs::CarteController < Champs::ChampController
   def index
     @focus = params[:focus].present?

app/controllers/champs/champ_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Champs::ChampController < ApplicationController
   before_action :authenticate_logged_user!
   before_action :set_champ

app/controllers/champs/piece_justificative_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Champs::PieceJustificativeController < Champs::ChampController
   def show
     respond_to do |format|

app/controllers/champs/repetition_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Champs::RepetitionController < Champs::ChampController
   def add
     row = @champ.add_row(@champ.dossier.revision)

app/controllers/champs/rna_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Champs::RNAController < Champs::ChampController
   def show
     champs_attributes = params.dig(:dossier, :champs_public_attributes) || params.dig(:dossier, :champs_private_attributes)

app/controllers/champs/siret_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Champs::SiretController < Champs::ChampController
   def show
     champs_attributes = params.dig(:dossier, :champs_public_attributes) || params.dig(:dossier, :champs_private_attributes)