use max1year on staff graph filter

webapp/src/pages/StaffGraph.tsx

@@ -158,6 +158,7 @@ function StaffGraph({ filterSelection, setFilterSelection, roles=false }: inputP
                 </Col>
                 <Col xs={3}>
                     <Filter
+                        max1year
                         filterOptions={{ availableYears: [...years], availableNrens: [...nrens] }}
                         filterSelection={filterSelection}
                         setFilterSelection={setFilterSelection}