Fix jellyfinScaleFactor implementation in kodi role

The original implementation had several issues that prevented it from
building:
- Used buildInputs instead of nativeBuildInputs for makeWrapper
- Referenced wrong executable name (jellyfinmediaplayer vs jellyfin-desktop)
- Used wrapProgram which doesn't work with symlinks from symlinkJoin

Fixed by using makeWrapper directly with the correct executable path
after removing the symlink.

Also enabled jellyfinScaleFactor = 1.5 on boxy for UI scaling.

roles/kodi/default.nix

@@ -48,10 +48,12 @@ in
       then pkgs.symlinkJoin {
         name = "jellyfin-media-player-scaled";
         paths = [ pkgs.jellyfin-media-player ];
-        buildInputs = [ pkgs.makeWrapper ];
+        nativeBuildInputs = [ pkgs.makeWrapper ];
         postBuild = ''
-          wrapProgram $out/bin/jellyfinmediaplayer \
-            --add-flags "--scale-factor ${toString cfg.jellyfinScaleFactor}"
+          mkdir -p $out/bin
+          rm -f $out/bin/jellyfin-desktop
+          makeWrapper ${pkgs.jellyfin-media-player}/bin/jellyfin-desktop $out/bin/jellyfin-desktop \
+            --add-flags "--tv --scale-factor ${toString cfg.jellyfinScaleFactor}"
         '';
       }
       else pkgs.jellyfin-media-player;