Disallow machine-petting

...on relevant versions of NC that support the "cuddly" group.

More automated ways to get furballs from cats MAY be supported, but
it probably doesn't make sense to use the "petting" mechanic,
especially since it only ever worked as long as a player is within
5m of the cat anyway.

Maybe something involving a brush/rake?

pet.lua

@@ -115,10 +115,11 @@ function myapi.notpurring(pos)
 	return not purrtime and {}
 end
 
+local petgroups = minetest.registered_items[""].tool_capabilities.groupcaps.cuddly and {cuddly = 1} or {thumpy = 1}
 nodecore.register_craft({
 		label = "pet cat",
 		action = "pummel",
-		toolgroups = {thumpy = 1},
+		toolgroups = petgroups,
 		indexkeys = {"group:" .. modname .. "_face"},
 		check = function(pos)
 			return myapi.notpurring(pos) and playernear(pos)