Fixed double forward slashes and incorrect active module highlighting

Due to an extra forward slash the network modules had the following URL:
``/mods/network/Freenode/watch2//configure``
instead of:
``/mods/network/Freenode/watch2/configure``

Invalid active highlighting
Before: http://i.imgur.com/49k52SS.png
After: http://i.imgur.com/Hu9esjn.png