avoid lambda props

This fixes the simple cases of callback props using lambda functions.
This will prevent rerendering in some cases since a new callback
function is not created on each call.

src/about/AboutDialog.test.tsx

@@ -10,7 +10,7 @@ import AboutDialog from './AboutDialog';
 it('should close when the button is clicked', () => {
     const close = jest.fn();
 
-    const [dialog] = testRender(<AboutDialog isOpen={true} onClose={() => close()} />);
+    const [dialog] = testRender(<AboutDialog isOpen={true} onClose={close} />);
 
     userEvent.click(dialog.getByLabelText('Close'));
 

src/about/AboutDialog.tsx

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-// Copyright (c) 2021 The Pybricks Authors
+// Copyright (c) 2021-2022 The Pybricks Authors
 
 // The about dialog
 
@@ -33,7 +33,7 @@ const AboutDialog: React.FunctionComponent<AboutDialogProps> = (props) => {
         <Dialog
             title={`Pybricks v${firmwareVersion} (${appName} v${appVersion})`}
             isOpen={props.isOpen}
-            onClose={() => props.onClose()}
+            onClose={props.onClose}
         >
             <div className={Classes.DIALOG_BODY}>
                 <div className="pb-about-icon">