Fix LegendWidget update logic for multiple legends case

[juandjara]

Description

Shortcut: https://app.shortcut.com/geographica/story/425245

Fix react-redux action updateLayer to account for the case of multiple legend objects per layer, keeping array object reference.

Type of change

• Fix

Acceptance

Please describe how to validate the feature or fix

1. Render a in which one layer has multiple legends
2. Collapse or hide one of those legends
3. Uncollapse or show the same legend
4. It should be back to its original state

This feature is not used in cloud-native but it is used in various PS projects such as Groupauto, DHL, and more

Basic checklist

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

[github-actions]

Pull Request Test Coverage Report for Build 10006952761

Details

• 2 of 3 (66.67%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.004%) to 71.194%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/react-redux/src/slices/cartoSlice.js	2	3	66.67%

Totals
Change from base Build 9805322941:	-0.004%
Covered Lines:	2816
Relevant Lines:	3642

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💛 - Coveralls

[github-actions]

Visit the preview URL for this PR (updated for commit 8bc630a):

https://cartodb-fb-storybook-react-dev--pr889-fix-legend-widge-8371ldbn.web.app

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