[Bug][ListBox] toolbarPosition does not respect bottom and none positions

[filipKovachev]

I'm submitting a...

• Bug report

Current behavior

When passing position none to the ListBoxToolbar the UI becomes messed up and if position bottom is passed, the toolbar is not positioned on the bottom

Expected behavior

Setting position none should not mess up the UI and setting bottom should position the toolbar on the bottom.

Minimal reproduction of the problem with instructions

1. Open this example: https://stackblitz.com/edit/react-2vwsfq-ajqybs?file=app%2Fmain.tsx
2. Notice how the UI is messed up due to position none being set.
3. Set toolbarPosition to bottom and observe how it does not take effect.