Add interpreter and cleanup imports + carriage returns

1) Added interpreter #!/usr/bin/python3 to allow for running as ./PVEDiscordDark.py
2) Remove redundant import of os after sys
3) Cleaned up carriage return characters ^M from file to resolve the following error: -bash: ./PVEDiscordDark.py: /usr/bin/python3^M: bad interpreter: No such file or directory

PVEDiscordDark.py

@@ -1,11 +1,13 @@
-import sys,os
+#!/usr/bin/python3
+
+import os
+import sys
+import time
 import subprocess
 import urllib.request
 import os.path
 import shutil
 import argparse
-import os
-import time
 
 ACTION = None