revert implement topnav in user settings

refs FOO-4085
flag=instui_nav

test plan
- feature options on
  User Settings: /profile/settings
  should be displayed

Change-Id: Ic3fc71af4e64b679c06de9b0dc1f0fa2a0f7c9c9
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/349439
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
QA-Review: Michael Hulse <michael.hulse@instructure.com>
Product-Review: Michael Hulse <michael.hulse@instructure.com>
Reviewed-by: August Thornton <august@instructure.com>

app/controllers/profile_controller.rb

@@ -229,7 +229,6 @@ class ProfileController < ApplicationController
           NEW_USER_TUTORIALS_ENABLED_AT_ACCOUNT: show_tutorial_ff_to_user,
           CONTEXT_BASE_URL: "/users/#{@user.id}"
         )
-        page_has_instui_topnav
         render :profile
       end
       format.json do

ui/features/profile/index.jsx

@@ -25,7 +25,6 @@ import ReactDOM from 'react-dom'
 import GeneratePairingCode from '@canvas/generate-pairing-code'
 import ready from '@instructure/ready'
 import FeatureFlags from '@canvas/feature-flags'
-import TopNavPortal from '@canvas/top-navigation/react/TopNavPortal'
 
 ready(() => {
   const hiddenFlags = []
@@ -33,8 +32,6 @@ ready(() => {
     hiddenFlags.push('new_user_tutorial_on_off')
   }
 
-  ReactDOM.render(<TopNavPortal />, document.querySelector('#react-instui-topnav'))
-
   ReactDOM.render(
     <FeatureFlags hiddenFlags={hiddenFlags} disableDefaults={true} />,
     // There is only one of these