Glass pane recipes restored - horizontal panes fix

Note: This is tested on 1.21.1, but to my knowledge it should work with any newer version too, I don't think the folder structure changed. No promises, but worth a try. 

I am running a server, and I installed Horizontal Panes by Gamma1772. Sadly, this mod removes the vanilla recipe for crafting glass panes, rendering the mod somewhat unusable. Looking around, I saw some other horizontal glass pane mods had the same issue, so rather than removing it from my server, I wrote a small datapack that simply adds the recipes back.  

This SHOULD be compatible with any mod as all it actually does is add the glass pane recipes as a data pack, but I can't predict everything of course.