Header in Nightly Experiments is broken due to misplaced text

[Aleksandra0056]

Describe the bug

The text "Changing advanced configuration settings can impact Nightly performance or security" is placed twice leading to a broken header of the Nightly Experiments page.

The upper text is misplaced and should be removed, while the bottom text is in the correct place and should stay in place.

Expected behavior

My solution is to remove the misplaced upper text on the Nightly Experiments page.

I should report this to Bugzilla, but they are fixing specific bugs for an eternity, so I focus on reporting it here instead.

Screenshots

Screenshot depicturing the Nightly Experiments page:

Ditto, but without Firefox UI Fix (for comparison):

OS

Windows 10

OS - Others

No response

Firefox Version

Nightly (64-bit)

Distribution

• [X] Original Lepton
• [ ] Lepton's photon style
• [ ] Lepton's proton style

Theme

• [X] Light
• [X] Dark
• [ ] Alpenglow (System: Light)
• [ ] Alpenglow (System: Dark)
• [ ] System Default
• [ ] Others: (e.g. Photon Colors, Google Chrome Dark, Fairytale Of Nature)

Theme - More Info

No response

user.js setup

user.js setup

```javascript // I can't upload the user.js setup data since my Nightly instance was on Windows Sandbox VM. ```

Additional context

No response

[Aleksandra0056]

Okay, it's now fixed. Thank you for commit and quick fix!