[Edit Bookmark][Edit folder] "Save In" section heading is sticky and moves across the page along with scroll down

Steps to Reproduce:

1. On FF, sign in with an account with 10+ folders and bookmarks.
2. From the three dots menu, select Bookmarks.
3. Tap the Edit button. Reach the Edit Folder/bookmark screen.
4. View the “Save in” section and tap on Bookmarks folder to unfold the options.
5. Scroll down through the options.

Expected Result:

“Save in” section heading is not overlapping any of the bookmark fields as we scroll.

Actual Result:

“Save in” section heading is overlapping the folder fields.

Device & Build Information:

• Device: iPhone 14 Pro max (iOS 26)
• Build version: v143.2 (62039)

:information_source: Reference Person

+@Foxbolts+

┆Issue is synchronized with this Jira Bug