Remove duplicate test

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

features/project/public.feature

-Feature: Public Projects
-  Background:
-    Given I sign in as a user
-
-  Scenario: I should see the list of public projects
-    When I visit the public projects area
-    Then I should see the list of public projects
-

features/steps/project/public.rb

-class PublicProjects < Spinach::FeatureSteps
-  include SharedAuthentication
-  include SharedProject
-  include SharedPaths
-
-  Then 'I should see the list of public projects' do
-    page.should have_content "Public Projects"
-  end
-end