Fix issue width get's ignored with scrollable dialogs

[06b]

Description

When flex: 1 1 0px get's applied to a scrollable dialog it takes up the full width, so change it so it only gets applied to the form that's nested within a scrollable dialog

Motivation and Context

Fixes #6479

How Has This Been Tested?

visually

Markup:

// Paste your FULL Playground.vue here

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 not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes and documentation updates, dev for new features and breaking changes).
• My code follows the code style of this project.
• I've added relevant changes to the documentation (applies to new features and breaking changes in core library)

[MajesticPotatoe]

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[06b]

I believe by removing this that it will re-introduce #3713 based off of this f90c8b9

[DRoet]

^^ @MajesticPotatoe @KaelWD

[lock]

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