Remove duplicate tests from features/menu_test.rb

@bwinterling @srt32 
Hi guys. I started working on our 2 test bugs that were in the menu.rb file:
- "guest can browse menu page" (tracker id: 61989768)
- "guest can sort by specific category" (tracker id: 61989810)

The tests weren't written such that they were testing what the author (probably me, ha!) thought they were testing. The original intent of both tests was to simply ensure that a user could filter menu items by category. I believe this is adequately covered in the can_view_by_categories.rb.

Let me know if you disagree, or if I missed something critical.