xsession.pointerCursor: escape special characters in the cursor path (#2805)

- Escape special character in the cursor name and default cursor file name
  in the cursor path for the xsetroot command.

modules/xcursor.nix

@@ -36,6 +36,10 @@ let
     };
   };
 
+  cursorPath = "${cfg.package}/share/icons/${escapeShellArg cfg.name}/cursors/${
+      escapeShellArg cfg.defaultCursor
+    }";
+
 in {
   meta.maintainers = [ maintainers.league ];
 
@@ -63,9 +67,7 @@ in {
     home.packages = [ cfg.package ];
 
     xsession.initExtra = ''
-      ${pkgs.xorg.xsetroot}/bin/xsetroot -xcf ${cfg.package}/share/icons/${cfg.name}/cursors/${cfg.defaultCursor} ${
-        toString cfg.size
-      }
+      ${pkgs.xorg.xsetroot}/bin/xsetroot -xcf ${cursorPath} ${toString cfg.size}
     '';
 
     xresources.properties = {