fix(app-shell): small fix to works fine the resizable

[vicalcantFrontEnd]

Description

Small fixes to works fine the Help Resizable property..

What's included?

• change the variable helpResizable instead resizing into the app-shell.stories.js

Test Steps

• [ ] npm run start
• [ ] then this
• [ ] finally this

General Tests for Every PR

• [ ] npm run start still works.
• [ ] npm run lint passes.
• [ ] npm run stylelint passes.
• [ ] npm test passes and code coverage is not lower.
• [ ] npm run build still works.

Screenshots or link to StackBlitz/Plunker

[owilliams320]

:tada: This PR is included in version 8.12.3 :tada:

The release is available on:

• v8.12.3
• GitHub release

Your semantic-release bot :package::rocket: