Use current user in votes components

Just like we do in most places; we almost never use `user_signed_in?`.

app/components/debates/votes_component.html.erb

@@ -1,7 +1,7 @@
 <% voted_classes = css_classes_for_vote(debate) %>
 <div class="votes">
   <div class="in-favor inline-block">
-    <% if user_signed_in? %>
+    <% if current_user %>
       <%= link_to vote_debate_path(debate, value: "yes"),
           class: "like #{voted_classes[:in_favor]}", title: t("votes.agree"), method: "post", remote: true do %>
         <span class="icon-like">
@@ -22,7 +22,7 @@
   <span class="divider"></span>
 
   <div class="against inline-block">
-    <% if user_signed_in? %>
+    <% if current_user %>
       <%= link_to vote_debate_path(debate, value: "no"), class: "unlike #{voted_classes[:against]}", title: t("votes.disagree"), method: "post", remote: true do %>
         <span class="icon-unlike">
           <span class="show-for-sr"><%= t("votes.disagree") %></span>
@@ -43,19 +43,19 @@
     <%= t("debates.debate.votes", count: debate.votes_score) %>
   </span>
 
-  <% if user_signed_in? && current_user.organization? %>
+  <% if current_user&.organization? %>
     <div class="participation-not-allowed" style="display:none" aria-hidden="false">
       <p>
         <%= t("votes.organizations") %>
       </p>
     </div>
-  <% elsif user_signed_in? && !debate.votable_by?(current_user) %>
+  <% elsif current_user && !debate.votable_by?(current_user) %>
     <div class="participation-not-allowed" style="display:none" aria-hidden="false">
       <p>
         <%= sanitize(t("votes.anonymous", verify_account: link_to_verify_account)) %>
       </p>
     </div>
-  <% elsif !user_signed_in? %>
+  <% elsif !current_user %>
     <div tabindex="0">
       <%= render "shared/login_to_vote" %>
     </div>

app/components/debates/votes_component.rb

@@ -1,6 +1,6 @@
 class Debates::VotesComponent < ApplicationComponent
   attr_reader :debate
-  delegate :css_classes_for_vote, :current_user, :link_to_verify_account, :user_signed_in?, :votes_percentage, to: :helpers
+  delegate :css_classes_for_vote, :current_user, :link_to_verify_account, :votes_percentage, to: :helpers
 
   def initialize(debate)
     @debate = debate