Add scrollbars for Toolbox and Layout | Studio

[kale1d0code]

Description

Fixes a regression which removed the independent scrollbars for the Toolbox and Layout elements within Layout Editor.

Motivation and Context

Scrolling in the layout editor has become troublesome.
It is no longer possible to scroll to the panel and field slot you want a field to appear in without the list of fields moving at the sametime.

This change makes it so that the list of fields and the field positions can be scrolled through independantly.

How To Test This

Open Studio and navigate through to the layout editor on a module with enough panels and fields to require scrollbars on both.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Final checklist

• My code follows the code style of this project found here.
• My change requires a change to the documentation.
• I have read the How to Contribute guidelines.

[SuiteBot]

All committers have signed the CLA.

[serhiisamko091184]

Hello @kale1d0code,

thanks for your contribution!

Regards,
Serhii