Revert "Change "Group#web_url" to return "/groups/twitter" rather than "/twitter"."

This reverts commit c81ff152.

app/models/group.rb

@@ -68,7 +68,7 @@ class Group < Namespace
   end
   def web_url
-    Gitlab::Routing.url_helpers.group_canonical_url(self)
+    Gitlab::Routing.url_helpers.group_url(self)
   end
   def human_name

config/routes/group.rb

@@ -12,26 +12,23 @@ constraints(GroupUrlConstrainer.new) do
   end
 end
-scope constraints: { id: /[a-zA-Z.0-9_\-]+(?<!\.atom)/ } do
-  resources :groups, except: [:show] do
-    member do
-      get :issues
-      get :merge_requests
-      get :projects
-      get :activity
-    end
-    scope module: :groups do
-      resources :group_members, only: [:index, :create, :update, :destroy], concerns: :access_requestable do
-        post :resend_invite, on: :member
-        delete :leave, on: :collection
-      end
-      resource :avatar, only: [:destroy]
-      resources :milestones, constraints: { id: /[^\/]+/ }, only: [:index, :show, :update, :new, :create]
-      resources :labels, except: [:show], constraints: { id: /\d+/ }
-    end
+resources :groups, constraints: { id: /[a-zA-Z.0-9_\-]+(?<!\.atom)/ }  do
+  member do
+    get :issues
+    get :merge_requests
+    get :projects
+    get :activity
+  end
+  scope module: :groups do
+    resources :group_members, only: [:index, :create, :update, :destroy], concerns: :access_requestable do
+      post :resend_invite, on: :member
+      delete :leave, on: :collection
+    end
+    resource :avatar, only: [:destroy]
+    resources :milestones, constraints: { id: /[^\/]+/ }, only: [:index, :show, :update, :new, :create]
+    resources :labels, except: [:show], constraints: { id: /\d+/ }
   end
-  get 'groups/:id' => 'groups#show', as: :group_canonical
 end

spec/models/group_spec.rb

@@ -265,10 +265,4 @@ describe Group, models: true do
     members
   end
-
-  describe '#web_url' do
-    it 'returns the canonical URL' do
-      expect(group.web_url).to include("groups/#{group.name}")
-    end
-  end
 end