[PLT-6496] Remove System Console and config settings for image height and width (#6688)

* remove System Console and config settings for image height and width

* add constants and update config.json

* updated as per review

webapp/components/setting_picture.jsx

@@ -7,9 +7,10 @@ import React, {Component} from 'react';
 import {FormattedMessage} from 'react-intl';
 
 import FormError from 'components/form_error.jsx';
-
 import loadingGif from 'images/load.gif';
 
+import Constants from 'utils/constants.jsx';
+
 export default class SettingPicture extends Component {
     static propTypes = {
         clientError: PropTypes.string,
@@ -114,8 +115,8 @@ export default class SettingPicture extends Component {
                                 id='setting_picture.help'
                                 defaultMessage='Upload a profile picture in BMP, JPG, JPEG or PNG format, at least {width}px in width and {height}px height.'
                                 values={{
-                                    width: global.mm_config.ProfileWidth,
-                                    height: global.mm_config.ProfileHeight
+                                    width: Constants.PROFILE_WIDTH,
+                                    height: Constants.PROFILE_WIDTH
                                 }}
                             />
                         </li>