Icon theme is reset on dark/light theme switch

[Junior Martins]

### Affected version
GNOME Shell 45.2 on Ubuntu 23.10 (Wayland)

### Bug summary

When you switch between dark and light mode the icon theme is reset. This also affects other theming options, such as the "Legacy applications" theme option in Gnome Tweaks. I suspect that it also affects the primary color settings, since I remember having it changed to the default orange after switching from light to dark some days ago, but I don't remember what setting I changed before this.

### Steps to reproduce

1. On Gnome Tweaks > Appearance, change the icon theme (I used Papyrus dark)
2. On the quick toggles, switch between dark and light mode
3. Switch again between dark and light mode

### What happened

The icon theme is changed to "Yaru-blue" and then to "Yaru-blue-dark"

### What did you expect to happen

No change to my icon theme, or at least use its light variant.

### Relevant info

Some `gsettings` options:

```bash
# After changing the icon theme
org.gnome.desktop.interface color-scheme 'prefer-dark'
org.gnome.desktop.interface gtk-theme 'Yaru-blue-dark'
org.gnome.desktop.interface icon-theme 'Papirus-Dark'

# After switching to light mode
org.gnome.desktop.interface color-scheme 'default'
org.gnome.desktop.interface gtk-theme 'Yaru-blue'
org.gnome.desktop.interface icon-theme 'Yaru-blue'

# After switching to dark mode again
org.gnome.desktop.interface color-scheme 'prefer-dark'
org.gnome.desktop.interface gtk-theme 'Yaru-blue-dark'
org.gnome.desktop.interface icon-theme 'Yaru-blue-dark'
```

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: gnome-shell 45.2-0ubuntu1
ProcVersionSignature: Ubuntu 6.5.0-21.21-generic 6.5.8
Uname: Linux 6.5.0-21-generic x86_64
ApportVersion: 2.27.0-0ubuntu5
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Fri Feb 23 21:57:38 2024
DisplayManager: gdm3
InstallationDate: Installed on 2023-07-25 (213 days ago)
InstallationMedia: Ubuntu 23.04 "Lunar Lobster" - Release amd64 (20230418)
RelatedPackageVersions: mutter-common 45.2-0ubuntu3
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to mantic on 2023-10-29 (117 days ago)