Update example.py

Fix example.py typo liftoff#698
liftoff#698
By w84miracle

gateone/applications/terminal/plugins/example/example.py

@@ -97,7 +97,7 @@ def get(self):
         # or 'upn' for short.  Why?  Because it might actually be a username
         # plus a realm or domain name.  e.g. user@REALM or [email protected]
         username = user_dict['upn']
-        session = user_dict['session'][:3] # Just the last three (for security)
+        session = user_dict['session'][:-3] # Just the last three (for security)
         self.render(
             example_template, # The path to a template file
             bygolly=bygolly, # Just match up your template's {{whatever}} with