Makes lua file upload work with bigger files and standardizes a few file|null (#82202)

## About The Pull Request
My lua scripts were hitting the topic byte limit, so this makes file
upload of lua scripts able to bypass the topic limit.

## Why It's Good For The Game
Removes arbitrary restriction on how big a lua file can be in bytes.

## Changelog
🆑
admin: Admins can now run lua files bigger than 36 KB by importing them
directly.
/🆑

Co-authored-by: Watermelon914 <3052169-Watermelon914@users.noreply.gitlab.com>

code/modules/wiremod/core/duplicator.dm

@@ -233,7 +233,7 @@ GLOBAL_LIST_INIT(circuit_dupe_whitelisted_types, list(
 	var/txt
 	switch(option)
 		if("File")
-			txt = file2text(input(usr, "Input File") as file|null)
+			txt = file2text(input(usr, "Input File") as null|file)
 		if("Direct Input")
 			txt = input(usr, "Input JSON", "Input JSON") as text|null