[MM-60079] Converted ./reducers/views/modals.test.tsx class component to functional component (#28033)

* fix: converted class component to functional component

* fix: resolved the eslint error

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

webapp/channels/src/reducers/views/modals.test.tsx

@@ -8,8 +8,7 @@ import {modalState as modalStateReducer} from 'reducers/views/modals';
 
 import {ActionTypes, ModalIdentifiers} from 'utils/constants';
 
-class TestModal extends React.PureComponent {
+const TestModal = () => {
-    render() {
     return (
         <Modal
             show={true}
@@ -19,8 +18,7 @@ class TestModal extends React.PureComponent {
             <Modal.Body/>
         </Modal>
     );
-    }
+};
-}
 
 describe('Reducers.Modals', () => {
     test('Initial state', () => {