<DropdownBase/> - expose flip&fixed params and pass it down to popover (#3498)
<DropdownBase/> - expose flip&fixed params and pass it down to popover (#3498)

* expose flip&fixed params and pass it down to popover

* Update DropdownBase.js

* fix bool type

wix/wix-style-react,wix/wix-style-react,wix/wix-style-react,wix/wix-style-react