revert: "feat: Set SteamOS theme by default"

No longer needed with desktop presets

This reverts commit ff6e9f437fcbe40ea61b1bbab00ee7cca42784fd.

system_files/deck/usr/share/ublue-os/firstboot/yafti.yml

@@ -83,11 +83,6 @@ screens:
           default: true
           packages:
           - Create Steam shortcuts: just --unstable create-steam-shortcuts
-        Theme:
-          description: Set the default KDE theme
-          default: true
-          packages:
-            - Setup Theme: just setup-theme
         Use EXT4 for SD Cards:
           description: Disable BTRFS support for SD cards for direct compatibility with SD cards formatted on stock SteamOS (Not recommended).
           default: false

system_files/deck/usr/share/ublue-os/just/custom.just

@@ -27,9 +27,6 @@ install-nix: _auth
 remove-nix: _auth
   sudo curl -s https://raw.githubusercontent.com/dnkmmr69420/nix-installer-scripts/main/uninstaller-scripts/silverblue-nix-uninstaller.sh | bash
 
-setup-theme:
-  lookandfeeltool -a com.valve.vapor.desktop
-
 get-greenlight:
   echo 'Retrieving Greenlight'
   wget https://github.com/unknownskl/greenlight/releases/download/v2.0.0-beta8/Greenlight-2.0.0-beta8.AppImage -O ~/Desktop/Greenlight.AppImage

system_files/desktop/usr/share/ublue-os/firstboot/yafti.yml

@@ -64,11 +64,6 @@ screens:
           default: true
           packages:
           - Enable System76 Scheduler: just --unstable enable-system76-scheduler
-        Theme:
-          description: Set the default KDE theme
-          default: true
-          packages:
-            - Setup Theme: just setup-theme
         Wallpaper Engine:
           description: Enables Wallpaper Engine
           default: true

system_files/desktop/usr/share/ublue-os/just/custom.just

@@ -19,9 +19,6 @@ install-nix: _auth
 remove-nix: _auth
   sudo curl -s https://raw.githubusercontent.com/dnkmmr69420/nix-installer-scripts/main/uninstaller-scripts/silverblue-nix-uninstaller.sh | bash
 
-setup-theme:
-  lookandfeeltool -a com.valve.vapor.desktop
-
 enable-big-picture:
   systemctl enable --now plasma-autologin
   sed -i 's@/usr/bin/steam-runtime -silent %U@/usr/bin/steam-runtime -bigpicture %U@g' ~/.config/autostart/bazzite-arch-steam-silent.desktop