[BUG] dcc.Dropdown value does not update when an option is removed (regression from #1868)

[Thuener]

Describe your context
Please provide us your environment, so we can easily reproduce the issue.

• replace the result of pip list | grep dash below

dash                 2.13.0

Describe the bug
Regression #1868
When the options of a dcc.Dropdown are updated to remove a currently selected option, the UI updates to remove that value, but the value parameter does not update.

Expected behavior

Removing an option from options should also remove that option from value, that way it will be sync with the UI.

Screenshots

Using the same code as #1868 but with version 2.13.0 we have

[TillerBurr]

I was able to pinpoint the problem to the code

dash/components/dash-core-components/src/fragments/Dropdown.react.js

Lines 123 to 129 in f7f8fb4

	useEffect(() => {
	if (
	!searchable &&
	!isNil(sanitizedOptions) &&
	optionsCheck !== sanitizedOptions &&
	!isNil(value)
	) {

In particular, the searchable check is somewhat problematic. Removing it fixes the issue because the dropdown in the example is searchable by default. The reason that it was there to begin with is that without that check, it reintroduces the issue #2099.

I'd have to think about how to properly solve this.