Fix #4032 broken Module Builder Layouts screens

[pgorod]

Description

See the Issue #4032 for an explanation.

How To Test This

Enter module builder, create new module, access any layout screen. With the bug, the layout doens't even open. With the fix, it all works fine again.

But attention, I am doing this change superficially, without a real understanding of these classes and with limited PHP expertise, please consider what other implications this change might have, in other places which I might have failed to check! Thanks

Types of changes

• [ X ] 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

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

[daniel-samson]

I have a more correct fix for this in my pull request #3918. This corrects this issue plus other issues in module builder.