SaveDashboard: Fix for folder picker menu not being visible outside modal (#24296)

* Change z-index

* Add position and width to menuPortal

packages/grafana-ui/src/components/Select/SelectBase.tsx

@@ -312,7 +312,9 @@ export function SelectBase<T>({
         }}
         styles={{
           ...resetSelectStyles(),
-          menuPortal: () => ({
+          menuPortal: ({ position, width }: any) => ({
+            position,
+            width,
             zIndex: theme.zIndex.dropdown,
           }),
           //These are required for the menu positioning to function