luaPackages.nlua: keep the full shebang

our override erased half of the shebang, altering thoroughly nlua's
behavior (we removed the -uNONE for instance), which I noticed while
running nix nlua on another project.

pkgs/development/lua-modules/overrides.nix

@@ -939,8 +939,12 @@ in
 
     # patchShebang removes the nvim in nlua's shebang so we hardcode one
     postFixup = ''
-      sed -i -e "1 s|.*|#\!${coreutils}/bin/env -S ${neovim-unwrapped}/bin/nvim -l|" "$out/bin/nlua"
+      substituteInPlace "$out/bin/nlua" \
+        --replace-fail \
+        "#!/usr/bin/env -S nvim" \
+        "#!${coreutils}/bin/env -S ${neovim-unwrapped}/bin/nvim"
     '';
+
     dontPatchShebangs = true;
   };