Fix changing group member permissions

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

app/views/groups/group_members/update.js.haml

 :plain
-  $("##{dom_id(@member)}").replaceWith('#{escape_javascript(render(@member, member: @member, show_controls: true))}');
+  $("##{dom_id(@group_member)}").replaceWith('#{escape_javascript(render(@group_member, member: @group_member, show_controls: true))}');

features/steps/groups.rb

@@ -153,6 +153,10 @@ class Spinach::Features::Groups < Spinach::FeatureSteps
         click_on 'Save'
       end
     end
+
+    page.within "#group_member_#{member.id}" do
+      expect(page).to have_content "Developer"
+    end
   end
 
   step 'I go to "Audit Events"' do