Use AJAX requests to select legislation proposals

Now the interface is more similar to the one in budget investments.

app/controllers/admin/legislation/proposals_controller.rb

@@ -12,7 +12,5 @@ class Admin::Legislation::ProposalsController < Admin::Legislation::BaseControll
   def toggle_selection
     @proposal.toggle :selected
     @proposal.save!
-    redirect_to admin_legislation_process_proposals_path,
-                notice: t('admin.legislation.proposals.update.notice')
   end
 end

app/views/admin/legislation/proposals/_proposals.html.erb

@@ -19,7 +19,7 @@
           <td class="text-center"><%= proposal.id %></td>
           <td><%= proposal.title %></td>
           <td class="text-center"><%= proposal.cached_votes_up %></td>
-          <td><%= render "select_proposal", proposal: proposal %></td>
+          <td class="select"><%= render "select_proposal", proposal: proposal %></td>
         </tr>
       <% end %>
     </tbody>

app/views/admin/legislation/proposals/_select_proposal.html.erb

@@ -8,5 +8,6 @@
 
 <%= link_to button_text,
             toggle_selection_admin_legislation_process_proposal_path(proposal.process, proposal),
+            remote: true,
             method: :patch,
             class: clas %>

app/views/admin/legislation/proposals/toggle_selection.js.erb

@@ -0,0 +1 @@
+$("#<%= dom_id(@proposal) %> .select").html('<%= j render("select_proposal", proposal: @proposal) %>');