contentTypes not passed from ContentPicker to ContentSearch

[johnwatkins0]

PR incoming.

Describe the bug

block-components/components/ContentPicker/index.js

Lines 106 to 111 in edb2b3a

	<ContentSearch
	placeholder={placeholder}
	label={label}
	excludeItems={excludeItems}
	onSelectItem={handleSelect}
	/>

Because contentTypes is not passed down, the default content types (post and page) are always used.

Steps to Reproduce

1. Use a ContentPicker component with a custom post type set as the contentType
2. Try the search
3. See that only posts and pages are returned

Expected behavior

Content picker can be restricted to a CPT