Fix: form builder page slug setting

[jonwaldstein]

Description

This fixes the page slug setting in the form builder to properly clean the permalink before updating the value.

Affects

The page slug settings in the form builder

Visuals

N/A

Testing Instructions

• Create a new or open an existing form
• Go to the page slug setting and type in something with spaces like My Awesome Donation Form!
• Save the form and make sure the slug is properly adjusted like my-awesome-donation-form

Pre-review Checklist

• Acceptance criteria satisfied and marked in related issue
• Relevant @unreleased tags included in DocBlocks
• Includes unit tests
• Reviewed by the designer (if follows a design)
• Self Review of code and UX completed

---

• To see the specific tasks where the Asana app for GitHub is being used, see below:
  • https://app.asana.com/0/0/1205499836297895

[jonwaldstein]

@kjohnson this is ready for review.

[kjohnson]

Looks good to me.

I misunderstood at first and kept trying to change the form title... I can confirm that updating the slug manually does clean the value correctly for a URL.