MDL-72589 behat: Create course with 3 sections (workaround)

With the default 5 sections course, after editing the activities, the
"log out" link is exactly on the edge of the view port. It's one of
those cases where Chrome fails to click/press it (have tried both).

So just make the course to have 3 sections is enough to avoid the
problem. Some day Chrome will fix that problem but, until then...
we cannot do much apart from changing the window size or try to
configure things to show differently.

availability/condition/group/tests/behat/availability_group.feature

@@ -6,8 +6,8 @@ Feature: availability_group
 
   Background:
     Given the following "courses" exist:
-      | fullname | shortname | format | enablecompletion |
-      | Course 1 | C1        | topics | 1                |
+      | fullname | shortname | format | enablecompletion | numsections |
+      | Course 1 | C1        | topics | 1                | 3           |
     And the following "users" exist:
       | username |
       | teacher1 |