MDL-46987 report_participation: Count duplicate logs as 1

Some of the actions generate more then 1 event.
Example: forum post create generate:
- post_created and
- accessible_uploaded
events which  gets logged at the same time.
Count them as 1 action and not 2, as it is
single action and report should show 1 and not 2

report/participation/index.php

@@ -265,7 +265,7 @@
 
     // Get record from sql_internal_reader and merge with records got from legacy log (if needed).
     if (!$onlyuselegacyreader) {
-        $sql = "SELECT ra.userid, $usernamefields, u.idnumber, l.actioncount AS count
+        $sql = "SELECT ra.userid, $usernamefields, u.idnumber, COUNT(l.actioncount) AS count
                   FROM (SELECT DISTINCT userid FROM {role_assignments} WHERE contextid $relatedctxsql AND roleid = :roleid ) ra
                   JOIN {user} u ON u.id = ra.userid
              $groupsql
@@ -278,7 +278,8 @@
                        AND anonymous = 0
                        AND contextlevel = :contextlevel
                        AND (origin = 'web' OR origin = 'ws')
-                  GROUP BY userid) l ON (l.userid = ra.userid)";
+                  GROUP BY userid,timecreated) l ON (l.userid = ra.userid)
+             GROUP BY ra.userid, $usernamefields, u.idnumber";
 
         $params['edulevel'] = core\event\base::LEVEL_PARTICIPATING;
         $params['contextlevel'] = CONTEXT_MODULE;