Don't add E2 tests to Wiremod's default data files

These tests are for developers and so shouldn't be shipped to people
who just install the addon through the workshop.

lua/wire/default_data_decompressor.lua

@@ -1,8 +1,13 @@
 -- Garry has imposed a file extension whitelist for the Steam Workshop which does not permit the dangerous format .txt
 -- Therefore, we must store our .txt's in default_data_files.lua, and then extract them when first run
 
+local ignored_dirs = {
+	["expression2/tests"] = true,
+}
+
 -- Compress all files in addons/wire/data recursively into 1 json string
 local function ReadDir(root)
+	if ignored_dirs[root] then return nil end
 	local tab = {}
 	local files,dirs = file.Find("addons/wire/data/"..root.."*","GAME")
 	for _, f in pairs(files) do
@@ -16,7 +21,7 @@ local function ReadDir(root)
 	return tab
 end
 -- Uncomment and Rename this file to wire/lua/wire/default_data_files.lua to update it
-//file.Write("default_data_files.txt", "//"..util.TableToJSON(ReadDir("")))
+-- file.Write("default_data_files.txt", "//"..util.TableToJSON(ReadDir("")))
 
 -- Decompress the json string wire/lua/wire/default_data_files.lua into the corresponding 36+ default data files
 local function WriteDir(tab)
@@ -34,7 +39,7 @@ if not file.Exists("expression2/_helloworld_.txt", "DATA") then
 	local compressed = file.Read("wire/default_data_files.lua","LUA")
 	-- The client cannot read lua files sent by the server (for security?), so clientside this'll only work
 	-- if the client actually has Wiremod installed, though with workshop autodownload that'll be common
-	if compressed != nil then
+	if compressed ~= nil then
 		WriteDir(util.JSONToTable(string.sub(compressed, 3)))
 	end
 end