fix --data-dir for COMMANDLINE_ARGS

move reading of COMMANDLINE_ARGS into paths_internal.py so --data-dir can be properly read

launch.py

@@ -3,16 +3,12 @@ import subprocess
 import os
 import sys
 import importlib.util
-import shlex
 import platform
 import json
 
 from modules import cmd_args
 from modules.paths_internal import script_path, extensions_dir
 
-commandline_args = os.environ.get('COMMANDLINE_ARGS', "")
-sys.argv += shlex.split(commandline_args)
-
 args, _ = cmd_args.parser.parse_known_args()
 
 python = sys.executable