Changed activities per session value in settings to 2.

It was 5 and would show a warning if a form was submitted with fewer
than 5 eligable activiy items in the course

#7

settings.php

@@ -39,7 +39,7 @@
                 'tool_driprelease/activitiespersession',
                 get_string('activitiespersession', 'tool_driprelease'),
                 get_string('activitiespersession_text', 'tool_driprelease'),
-                '5',
+                '2',
                 PARAM_ALPHANUMEXT,
                 3
         ));