fix duplicated logic for category selection in PieWidgetUI

[juandjara]

Description

This PR fixes the behaviour of PieWidgetUI clickEvent, removing duplicated logic that was re-appliying UI changes already applied in other useEffect calls. Before this changes, you couldn't recieve the onSelectedCategoriesChange event without affecting the UI of the chart. This change makes it so you can better control if the component is controlled or uncontrolled.

Type of change

• Fix

Acceptance

Acceptance is described here in terms of the component API

1. create a constant array with const categories = useRef([])
2. Render a <PieWidgetUI />
3. Pass as props selectedCategories={categories.current} and onSelectedCategoriesChange={(value) => console.log(value)}
4. When clicked, the UI of the chart should not be modified (the clicked part should not be highlighted)

Basic checklist

• Good PR name
• Shortcut link
• Changelog entry
• Just one issue per PR
• GitHub labels
• Proper status & reviewers
• Tests
• Documentation

[coveralls]

Pull Request Test Coverage Report for Build 1848313894

• 2 of 14 (14.29%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 70.335%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/react-ui/src/widgets/PieWidgetUI.js	2	14	14.29%

Totals
Change from base Build 1848194146:	-0.1%
Covered Lines:	1219
Relevant Lines:	1633

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💛 - Coveralls

[Clebal]

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