Remove unnecessary advanced search path parameter

We can use the current path as URL instead of passing it every time.
Passing the `page: 1` parameter is also redundant since by default the
index goes to the first page and the search form does not send any page
parameter.

app/views/budgets/investments/index.html.erb

@@ -55,7 +55,7 @@
         </div>
       <% end %>
 
-      <%= render("shared/advanced_search", search_path: budget_investments_path(@budget)) %>
+      <%= render("shared/advanced_search") %>
 
       <% if unfeasible_or_unselected_filter %>
         <ul class="no-bullet submenu">

app/views/debates/index.html.erb

@@ -52,7 +52,7 @@
         </div>
       </div>
 
-      <%= render "shared/advanced_search", search_path: debates_path(page: 1) %>
+      <%= render "shared/advanced_search" %>
 
       <%= render "shared/order_links", i18n_namespace: "debates.index" %>
 

app/views/proposals/index.html.erb

@@ -73,8 +73,7 @@
       <% end %>
 
       <% unless params[:retired].present? || params[:selected].present? %>
-        <%= render "shared/advanced_search",
-                   search_path: proposals_path(page: 1) %>
+        <%= render "shared/advanced_search" %>
       <% end %>
 
       <% unless params[:selected].present? %>

app/views/shared/_advanced_search.html.erb

@@ -3,7 +3,7 @@
 </div>
 
 <div class="row advanced-search-form">
-  <%= form_tag search_path, id: "advanced_search_form", method: :get do %>
+  <%= form_tag request.path, id: "advanced_search_form", method: :get do %>
     <div id="js-advanced-search" data-advanced-search-terms="<%= @advanced_search_terms.present? %>" style="display: none">
 
       <div class="small-12 column">