Remove related code for unused actions from admin polls controller

Actions :search_booths and :search_officers in admin polls controller
are moved to other controllers since commit 20e31133a for
:search_booths and commit 19ec7f93b for :search_officers.

This then allows us to remove the code that references these actions in
the controller and in the administrator abilities.

app/controllers/admin/poll/polls_controller.rb

@@ -4,7 +4,6 @@ class Admin::Poll::PollsController < Admin::Poll::BaseController
   include ReportAttributes
   load_and_authorize_resource
 
-  before_action :load_search, only: [:search_booths, :search_officers]
   before_action :load_geozones, only: [:new, :create, :edit, :update]
 
   def index
@@ -86,14 +85,6 @@ class Admin::Poll::PollsController < Admin::Poll::BaseController
       [*attributes, *report_attributes, translation_params(Poll)]
     end
 
-    def search_params
-      params.permit(:poll_id, :search)
-    end
-
-    def load_search
-      @search = search_params[:search]
-    end
-
     def resource
       @poll ||= Poll.find(params[:id])
     end

app/models/abilities/administrator.rb

@@ -83,7 +83,7 @@ module Abilities
 
       can [:index, :create, :update, :destroy], Geozone
 
-      can [:read, :create, :update, :destroy, :add_question, :search_booths, :search_officers, :booth_assignments], Poll
+      can [:read, :create, :update, :destroy, :add_question, :booth_assignments], Poll
       can [:read, :create, :update, :destroy, :available], Poll::Booth
       can [:search, :create, :index, :destroy], ::Poll::Officer
       can [:create, :destroy, :manage], ::Poll::BoothAssignment