Py3: Update incorrect shebang

SABnzbd.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python33 -OO
+#!/usr/bin/python3 -OO
 # Copyright 2007-2019 The SABnzbd-Team <team@sabnzbd.org>
 #
 # This program is free software; you can redistribute it and/or

sabnzbd/utils/certgen.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python33
+#!/usr/bin/python3
 
 """
 Adapted from the docs of cryptography

sabnzbd/utils/happyeyeballs.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python33
+#!/usr/bin/python3
 # Python implementation of RFC 6555 / Happy Eyeballs: find the quickest IPv4/IPv6 connection
 # See https://tools.ietf.org/html/rfc6555
 # Method: Start parallel sessions using threads, and only wait for the quickest succesful socket connect

sabnzbd/utils/kronos.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python33
+#!/usr/bin/python3
 """Module that provides a cron-like task scheduler.
 
 This task scheduler is designed to be used from inside your own program.