fix filters for includeCourseRoleMembers and cohorts

src/components/Gradebook/GradebookFilters/StudentGroupsFilter/index.jsx

@@ -58,7 +58,7 @@ export class StudentGroupsFilter extends React.Component {
     const selectedCohortItem = this.props.cohorts.find(
       x => x.name === event.target.value,
     );
-    return selectedCohortItem ? selectedCohortItem.id : null;
+    return selectedCohortItem ? selectedCohortItem.id.toString() : null;
   }
 
   updateTracks(event) {

src/components/Gradebook/GradebookFilters/index.jsx

@@ -22,7 +22,8 @@ export class GradebookFilters extends React.Component {
     this.handleIncludeTeamMembersChange = this.handleIncludeTeamMembersChange.bind(this);
   }
 
-  handleIncludeTeamMembersChange(includeCourseRoleMembers) {
+  handleIncludeTeamMembersChange(event) {
+    const includeCourseRoleMembers = event.target.checked;
     this.setState({ includeCourseRoleMembers });
     this.props.updateIncludeCourseRoleMembers(includeCourseRoleMembers);
     this.props.updateQueryParams({ includeCourseRoleMembers });