Fix deb version of PAM all caps naming

When this module was transitioned from pip (0.1.4) to deb (0.4.2-13.1),
the version in Raspbian contained an uppercase name for the module.
This method of importing fixes this and accounts for the pkg being
fixed in the future to be lowercase.

kano_settings/system/account.py

@@ -1,15 +1,21 @@
-#!/usr/bin/env python
-
 # account.py
 #
-# Copyright (C) 2014 Kano Computing Ltd.
+# Copyright (C) 2014-2018 Kano Computing Ltd.
 # License: http://www.gnu.org/licenses/gpl-2.0.txt GNU General Public License v2
 #
 # Contains the account screen backend functions
 
+
 import os
-import pam
-from kano.utils import get_user_unsudoed, run_cmd
+
+# When this module was transitioned from pip (0.1.4) to deb (0.4.2-13.1), the
+# version in Raspbian contained an all caps name for the module.
+try:
+    import PAM as pam
+except ImportError:
+    import pam
+
+from kano.utils import run_cmd
 from kano_world.functions import has_token