satysfi: fix the ipaexfont is not bundled properly

The ipaexfont package, which is an runtime depnedency of SATySFi,
changed their font installation path at this commit:
https://github.com/NixOS/nixpkgs/commit/af30ee15afe6cdb141d59f4827dba9b074666e93

This commit catches up with the change and make the ipaexfont be
bundled with the SATySFi package properly again.

pkgs/by-name/sa/satysfi/package.nix

@@ -79,7 +79,7 @@ ocamlPackages.buildDunePackage {
     mkdir -p $out/share/satysfi/dist/fonts
     cp -r lib-satysfi/dist/ $out/share/satysfi/
     cp -r \
-      ${ipaexfont}/share/fonts/opentype/* \
+      ${ipaexfont}/share/fonts/truetype/* \
       ${lmodern}/share/fonts/opentype/public/lm/* \
       ${lmmath}/share/fonts/opentype/latinmodern-math.otf \
       ${junicode}/share/fonts/truetype/Junicode-{Bold,BoldItalic,Italic}.ttf \