Remove delete_dialog from patchinfo controller

Its specs and route were also removed. This action isn't needed anymore
in the Bootstrap UI

src/api/app/controllers/webui/patchinfo_controller.rb

@@ -82,10 +82,6 @@ def destroy
     end
   end
 
-  def delete_dialog
-    render_dialog
-  end
-
   def update_issues
     authorize @project, :update?
 

src/api/config/routes.rb

@@ -170,7 +170,6 @@ def self.public_or_about_path?(request)
       post 'patchinfo/update_issues/:project/:package' => :update_issues, as: 'update_issues_patchinfo'
       get 'patchinfo/show/:project/:package' => :show, as: 'patchinfo_show', constraints: cons, defaults: { format: 'html' }
       get 'patchinfo/new_tracker' => :new_tracker
-      get 'patchinfo/delete_dialog' => :delete_dialog
     end
 
     controller 'webui/repositories' do

src/api/spec/controllers/webui/patchinfo_controller_spec.rb

@@ -317,13 +317,4 @@ def do_proper_post_save
       it { expect(response).to have_http_status(:success) }
     end
   end
-
-  describe 'GET #delete_dialog' do
-    before do
-      login user
-      get :delete_dialog, xhr: true, params: { project: user.home_project_name, package: patchinfo_package.name }
-    end
-
-    it { expect(response).to have_http_status(:success) }
-  end
 end