removed passing of useless params, updated placeholder for user textcomplete

app/views/forums/show.html.erb

@@ -2,13 +2,12 @@
 
 <h1>
   <%= title @forum %>
-  <% params[:id] = params[:id].split("-")[0] %>
-  <%= link_to "Search Threads", forumthreads_path(params.except("action", "controller")), class: "btn blue right" %>
+  <% params[:id] = @forum.id %>
+  <%= link_to "Search Threads", forumthreads_path(params.to_hash), class: "btn blue right" %>
 </h1>
 <% if @forum.can_write?(current_user) %>
   <p>
     <%= link_to "New thread", new_forumthread_path(forum: @forum), class: "btn blue" %>
-    <% params[:id] = params[:id].split("-")[0] %>
   </p>
 <% end %>