iterm2: fix passing args on the cli

If I try to run iterm2 on the cli, I get prompted to approve running
"installerPhase". We appear to be accidentally baking this into the
wrapper script rather than "$@" due to improper escaping.

pkgs/by-name/it/iterm2/package.nix

@@ -34,7 +34,7 @@ stdenvNoCC.mkDerivation rec {
     mkdir -p "$out/bin"
     cat << EOF > "$out/bin/iterm2"
     #!${stdenvNoCC.shell}
-    open -na "$APP_DIR" --args "$@"
+    open -na "$APP_DIR" --args "\$@"
     EOF
     chmod +x "$out/bin/iterm2"
     runHook postInstall