fix version path for editing

Signed-off-by: Florian Kraft <f.kraft@finn.de>

app/views/versions/show.html.erb

@@ -30,7 +30,7 @@ See doc/COPYRIGHT.rdoc for more details.
 <%= toolbar title: h(@version.name) do %>
  <% if authorize_for(:versions, :edit) %>
     <li class="toolbar-item">
-      <%= link_to(edit_version_path(@project, @version), class: 'button') do %>
+      <%= link_to(edit_version_path(@version), class: 'button') do %>
         <i class="button--icon icon-edit"></i>
         <span class="button--text"><%= l(:button_edit) %></span>
       <% end %>