[BUG] SpinButton doesn't allow for really compact sizes

[Shadowblitz16]

Describe the bug
There seems to be a border on the bottom of the title and the navigation seems to not shrink down

To Reproduce
Steps to reproduce the behavior:

1. Get a really small font like pico8 font
2. Customize the theme to work on a really tiny display like 128x128 pixels
3. Shrink the SBSpinButton's min height down to something like 10
4. See there is something blocking the title and the navigation doesn't shrink down

Expected behavior

1. When pegination is disabled the border below the title should go away
2. The navigation should shrink down to the same size as the title and should position propertly

Screenshots

Desktop (please complete the following information):

• OS: Kubuntu 22.04
• Godot Version: v4.2.2.stable.mono.official [15073afe3]

Additional context
None

[Shadowblitz16]

@yudinikita I can't figure out how to get around this with themes.
I even opened it in the theme editor and tried picking the controls to see if I could fix it.

There seems to be a crop off at the bottom of the title and padding at the top of the value/navigation