Fixed equals check, since database might return -1 as string

classes/local/table/interaction_remaining_table.php

@@ -164,7 +164,7 @@ class interaction_remaining_table extends interaction_table {
         }
         // Otherwise, show latest action commited by user.
         global $CFG;
-        if ($row->userid === -1) {
+        if ($row->userid == -1) {
             $userlink = get_string("anonymous_user");
         } else {
             $userlink = \html_writer::link($CFG->wwwroot . '/user/profile.php?id=' . $row->userid, fullname($row));