Fix rake taking credit for hand-digging nodes.

When you have a thing in your hand that doesn't help
you dig a node, but you can dig that node by hand,
then apparently the after_use callback still seems to
trigger, causing the rake effect, and wear-out.

mods/nc_woodwork/rake.lua

@@ -17,7 +17,9 @@ minetest.register_tool(modname .. ":rake", {
 				snappy = 1,
 			}),
 		sounds = nodecore.sounds("nc_tree_sticky"),
-		after_use = function(stack, user, _, digparams)
+		after_use = function(stack, user, node, digparams)
+			local def = node and node.name and minetest.registered_nodes[node.name]
+			if not (def and def.groups and def.groups.snappy) then return end
 			local pname = user and user:is_player() and user:get_player_name()
 			if pname then raked[pname] = digparams end
 			stack:add_wear(wearrate)

mods/nc_writing/init.lua

@@ -82,8 +82,7 @@ for i = 1, #glyphs do
 			buildable_to = true,
 			pointable = false,
 			groups = {
-				alpha_glyph = 1,
-				snappy = 1
+				alpha_glyph = 1
 			},
 			drop = coallump,
 			floodable = true