[MM-56843] Convert ./actions/views/modals.test.jsx from Class Component to Function Component (#26238)

webapp/channels/src/actions/views/modals.test.jsx

@@ -9,18 +9,14 @@ import {openModal, closeModal} from 'actions/views/modals';
 import mockStore from 'tests/test_store';
 import {ActionTypes, ModalIdentifiers} from 'utils/constants';
 
-class TestModal extends React.PureComponent {
+const TestModal = () => (
-    render() {
-        return (
     <Modal
         show={true}
     >
         <Modal.Header closeButton={true}/>
         <Modal.Body/>
     </Modal>
-        );
+);
-    }
-}
 
 describe('modals view actions', () => {
     let store;