CC-2760: Remove shebangs from files that don't need them, fix chmod of files

-done

python_apps/media-monitor/MediaMonitor.py

@@ -1,4 +1,3 @@
-#!/usr/local/bin/python
 import time
 import logging
 import logging.config

python_apps/show-recorder/recorder.py

@@ -1,4 +1,3 @@
-#!/usr/local/bin/python
 import urllib
 import logging
 import logging.config

utils/airtime-import/airtime-import.py

@@ -1,4 +1,3 @@
-#!/usr/local/bin/python
 import sys
 import os
 import logging