[W10] Top of url bar cut off with one_liner enabled

### Describe the bug

The top of the url bar is cut off when `one_liner` is enabled for all densities.

### Expected behavior

The bar should not be cut off and should have top padding matching the bottom.

### Screenshots


### OS

Windows 10

### OS - Others

_No response_

### Firefox Version

116.0.3-1 (Librewolf)

### Distribution

- [ ] [Original Lepton](https://github.com/black7375/Firefox-UI-Fix)
- [X] [Lepton's photon style](https://github.com/black7375/Firefox-UI-Fix/tree/photon-style)
- [ ] [Lepton's proton style](https://github.com/black7375/Firefox-UI-Fix/tree/proton-style)

### Theme

- [ ] Light
- [X] Dark
- [ ] Alpenglow (System: Light)
- [ ] Alpenglow (System: Dark)
- [ ] System Default
- [ ] Others: (e.g. [Photon Colors](https://addons.mozilla.org/en-US/firefox/addon/photon-colors/), [Google Chrome Dark](https://addons.mozilla.org/en-US/firefox/addon/google-chrome-dark/), [Fairytale Of Nature](https://addons.mozilla.org/en-US/firefox/addon/fairytale-of-nature/))

### Theme - More Info

_No response_

### `user.js` setup

user.js setup

```javascript
user_pref("userChrome.tabbar.one_liner", true);
```

### Additional context

1440p monitor with 125% display scaling

Start by reproducing the issue in Firefox on Windows 10 with the photon-style distribution, dark theme, and user.js setting user_pref("userChrome.tabbar.one_liner", true). Inspect the SCSS rules for the one_liner layout and verify the URL bar has matching top and bottom padding without clipping across densities.

Written by the indexing model from the issue text.