Implement closeOnChange for removeItemOnBackspace and handleLabelRemove

[stevenrick]

Feature Request

Problem description

I noticed that #1252 implemented an optional prop closeOnChange for Multiple Selection Dropdown that only works when selecting an item to add but does not apply when removing an item.

Proposed solution

Add this.closeOnChange(e) to the end of the following functions: removeItemOnBackspace and handleLabelRemove which are both in src/modules/Dropdown/Dropdown.js

MVP

Proof of concept (showing the problem): https://codesandbox.io/p/sandbox/semantic-ui-react-closeonchange-poc-69t37k Add items to selection, then remove items via label or backspace while dropdown is focused/open and element will remain open

Forked, Cloned, Installed, and Tested in PR #4492

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