treewide: remove redundant stylix.image escaping and string coercion

Remove redundant shell escaping and string coercion as stylix.image is
guaranteed to be a stringified store path with a valid string context
and no special characters.

Fixes: 3499e3ec70 ("treewide: properly quote stylix.image when used as a shell argument")

modules/hyprlock/hm.nix

@@ -11,9 +11,7 @@ mkTarget {
     (
       { cfg, image }:
       {
-        programs.hyprlock.settings.background.path = lib.mkIf cfg.useWallpaper "${
-          image
-        }";
+        programs.hyprlock.settings.background.path = lib.mkIf cfg.useWallpaper image;
       }
     )
     (

modules/hyprpaper/hm.nix

@@ -5,7 +5,7 @@ mkTarget {
     {
       services.hyprpaper.settings.wallpaper = lib.singleton {
         monitor = "";
-        path = toString image;
+        path = image;
       };
     };
 }