[useMultipleSelection] getDropdownProps doesn't call consumer supplied handlers when preventKeyAction is true

[juzerzarif]

When preventKeyAction is true for getDropdownProps it omits its own onKeyDown and onClick handlers but it also omits any keydown or click handler that the caller may have provided:

downshift/src/hooks/useMultipleSelection/index.js

Lines 211 to 214 in ee2a828

	...(!preventKeyAction && {
	onKeyDown: callAllEventHandlers(onKeyDown, dropdownHandleKeyDown),
	onClick: callAllEventHandlers(onClick, dropdownHandleClick),
	}),

I think a more predictable behavior would be to call the handlers supplied by the consumer regardless of preventKeyAction (they might have nothing to do with key actions).