propTypes error using new iconsTemplate

[keul]

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[ ] feature request
[ ] support request => Please do not submit support request here, instead see https://forum.primefaces.org/viewforum.php?f=57

When I submitted #716 seems I used the wrong prop-types type for the new iconsTemplate:

https://github.com/bopen/primereact/blob/8fe4b158ca09fe740e9b490cf787a1323378fd28/src/components/sidebar/Sidebar.d.ts#L14

I'm sorry for that. Now using the new feature you'll get a warning:

checkPropTypes.js?6ec4:19 Warning: Failed prop type: Invalid prop `iconsTemplate` of type `function` supplied to `Sidebar`, expected a single ReactElement