ctools_access_group_summary uses "AND" instead of "and"

The ctools_access_group_summary() function generates the access rules summary used in the Panels UI. While Panels and the rest of CTools use "and" and "or" are the value for the logic field, ctools_access_group_summary() uses "AND". This means that all summaries returned by the function use "or", even if they are actually and-s.

The attached patch corrects modifies ctools_access_group_summary() to expect "and" the same as the rest of CTools.