CC-3428: liquidsoap seems to have troubles with this file

-need to escape double quotes not single :P

python_apps/media-monitor/airtimefilemonitor/mediamonitorcommon.py

@@ -298,7 +298,7 @@ def test_file_playability(pathname):
     """
     liquidsoap_found = subprocess.call("which liquidsoap", shell=True)
     if liquidsoap_found == 0:
-        return_code = subprocess.call("liquidsoap -r \"%s\"" % pathname.replace("'", "\\'"), shell=True)
+        return_code = subprocess.call("liquidsoap -r \"%s\"" % pathname.replace('"', '\\"'), shell=True)
     else:
         return_code = 0