Update plain notification bell buttons in masthead to use notification badge

[mcoker]

There are some plain buttons with a bell icon that look like notification badges that should use the <NotificationBadge> component. For example in the dashboardwrapper

patternfly-react/packages/react-core/src/demos/DashboardHeader.tsx

Lines 106 to 115 in c9886ca

	{notificationBadge ?? (
	<ToolbarItem>
	<Button
	aria-label="Notifications"
	variant={ButtonVariant.plain}
	icon={<BellIcon />}
	onClick={() => {}}
	/>
	</ToolbarItem>
	)}