orthorobot: make patch urls reproducible

pkgs/games/orthorobot/default.nix

···
 
   patches = [
     # support for love11
+    # https://github.com/Stabyourself/orthorobot/pull/3
     (fetchpatch {
-      url = "https://github.com/Stabyourself/orthorobot/pull/3.patch";
+      name = "Stabyourself-orthorobot-pull-3.patch";
+      url = "https://github.com/Stabyourself/orthorobot/compare/48f07423950b29a94b04aefe268f2f951f55b62e...05856ba7dbf1bb86d0f16a5f511d8ee9f2176015.patch";
       sha256 = "sha256-WHHP6QM7R5eEkVF+J2pGNnds/OKRIRXyon85wjd3GXI=";
     })
   ];