Minor change to simplify filter and to allow access to currentpage

if more than 1 page is quicker to read than if more than or equal to two pages.
Adds currentPage to the tableState pagination object ala `tableState.pagination.currentPage` which is useful if your using server side pagination; the example shows using tableState.pagination.Start which after page 2 returns the record start count (which is fine if your using a Skip / Take style pagination in the backend but in reality most API's handle the paging)