Add lint for unused locals (#8007)

src/components/views/dialogs/LogoutDialog.tsx

@@ -1,6 +1,6 @@
 /*
 Copyright 2018, 2019 New Vector Ltd
-Copyright 2020 The Matrix.org Foundation C.I.C.
+Copyright 2020 - 2022 The Matrix.org Foundation C.I.C.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -81,11 +81,6 @@ export default class LogoutDialog extends React.Component<IProps, IState> {
         }
     }
 
-    private onSettingsLinkClick = (): void => {
-        // close dialog
-        this.props.onFinished(true);
-    };
-
     private onExportE2eKeysClicked = (): void => {
         Modal.createTrackedDialogAsync('Export E2E Keys', '',
             import(