Fix some active tab tests that are broken because of 2 level sidebar

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

app/views/layouts/nav/_dashboard.html.haml

@@ -15,7 +15,7 @@
       = icon('dashboard fw')
       %span
         Activity
-  = nav_link(path: ['groups#index']) do
+  = nav_link(path: ['dashboard/groups#index', 'explore/groups#index']) do
     = link_to dashboard_groups_path, title: 'Groups' do
       = icon('group fw')
       %span

features/steps/group/milestones.rb

@@ -5,8 +5,10 @@ class Spinach::Features::GroupMilestones < Spinach::FeatureSteps
   include SharedUser
 
   step 'I click on group milestones' do
+    within '.nav-secondary' do
       click_link 'Milestones'
     end
+  end
 
   step 'I should see group milestones index page has no milestones' do
     expect(page).to have_content('No milestones to show')

features/steps/project/active_tab.rb

@@ -82,8 +82,10 @@ class Spinach::Features::ProjectActiveTab < Spinach::FeatureSteps
   # Sub Tabs: Issues
 
   step 'I click the "Milestones" tab' do
+    within '.nav-secondary' do
       click_link('Milestones')
     end
+  end
 
   step 'I click the "Labels" tab' do
     click_link('Labels')

features/steps/shared/project_tab.rb

@@ -41,7 +41,7 @@ module SharedProjectTab
   end
 
   step 'the active main tab should be Settings' do
-    page.within '.nav-sidebar' do
+    page.within '.nav-secondary' do
       expect(page).to have_content('Go to project')
     end
   end