Replace format_price for Budget#formatted_amount

ApplicationHelper#format_price and Budget#formatted_amount has the same
objective and code, but the Budget#formatted_amount method also uses the
currency of the Budget to correctly give currencies format.

By replacing usage of format_price with formatted_amount we can remove
format_price and have a single location for currency format logic.

app/helpers/application_helper.rb

@@ -57,10 +57,6 @@ module ApplicationHelper
     SiteCustomization::ContentBlock.block_for(name, locale)
   end
 
-  def format_price(number)
-    number_to_currency(number, precision: 0, locale: I18n.locale)
-  end
-
   def kaminari_path(url)
     "#{root_url.chomp("\/")}#{url}"
   end

app/views/budgets/results/_results_table.html.erb

@@ -21,7 +21,7 @@
         <% if results_type == :compatible %>
           <th scope="col" class="text-right">
             <small><%= t("budgets.results.amount_available") %></small><br>
-            <%= format_price(heading_price) %><br>
+            <%= @budget.formatted_amount(heading_price) %><br>
           </th>
         <% end %>
       </tr>
@@ -53,12 +53,12 @@
               <%= investment.ballot_lines_count %>
             </td>
             <td class="text-center">
-              <%= format_price investment.price %>
+              <%= @budget.formatted_amount(investment.price) %>
             </td>
             <% if results_type == :compatible %>
               <td class="small text-right"
-                  title="<%= format_price(amount_available) %> - <%= format_price(investment.price) %>">
-                  <%= format_price amount_available - investment.price %>
+                  title="<%= @budget.formatted_amount(amount_available) %> - <%= @budget.formatted_amount(investment.price) %>">
+                  <%= @budget.formatted_amount(amount_available - investment.price) %>
                   <% amount_available -= investment.price if investment.winner? %>
               </td>
             <% end %>