Luacontroller: Fix bugs in 703e6fda, no more functions as keys

Thanks to @ShadowNinja for reporting this
Make sure functions that are keys in tables and functions inside nested tables also get removed when using digiline_send.

mesecons/util.lua

@@ -157,10 +157,12 @@ function mesecon.tablecopy_stripfunctions(table) -- deep table copy, but remove
 	local newtable = {}
 
 	for idx, item in pairs(table) do
-		if type(item) == "table" then
-			newtable[idx] = mesecon.tablecopy(item)
-		elseif type(item) ~= "function" then
-			newtable[idx] = item
+		if type(idx) ~= "function" then
+			if type(item) == "table" then
+				newtable[idx] = mesecon.tablecopy_stripfunctions(item)
+			elseif type(item) ~= "function" then
+				newtable[idx] = item
+			end
 		end
 	end