Revert ToolbarItem changes for the Whatsapp block

Since that block has a set of tests, the tests need to be able to use ToolbarItem. If I update the version of @wordpress/components so it includes ToolbarItem, the tests pass, but the overall block build fails:

    ERROR in ./node_modules/@wp-g2/create-styles/node_modules/postcss/lib/map-generator.js
    Module not found: Error: Can't resolve 'path' in '.../jetpack/node_modules/@wp-g2/create-styles/node_modules/postcss/lib'

Let's consequently hold off this change until @wordpress/components is properly updated in a separate PR: #16763.

projects/plugins/jetpack/extensions/blocks/send-a-message/whatsapp-button/configuration.js

@@ -10,7 +10,6 @@ import {
 	SelectControl,
 	Path,
 	ToggleControl,
-	ToolbarItem,
 	Button,
 	PanelBody,
 	ToolbarGroup,
@@ -148,17 +147,13 @@ export default function WhatsAppButtonConfiguration( { attributes, setAttributes
 	if ( context === 'toolbar' ) {
 		return (
 			<ToolbarGroup>
-				<ToolbarItem>
-					{ () => (
-						<Dropdown
-							position="bottom right"
-							className="jetpack-whatsapp-button-settings-selector"
-							contentClassName="jetpack-whatsapp-button__popover"
-							renderToggle={ ( { isOpen, onToggle } ) => renderSettingsToggle( isOpen, onToggle ) }
-							renderContent={ settings }
-						/>
-					) }
-				</ToolbarItem>
+				<Dropdown
+					position="bottom right"
+					className="jetpack-whatsapp-button-settings-selector"
+					contentClassName="jetpack-whatsapp-button__popover"
+					renderToggle={ ( { isOpen, onToggle } ) => renderSettingsToggle( isOpen, onToggle ) }
+					renderContent={ settings }
+				/>
 			</ToolbarGroup>
 		);
 	}