fix: keep always two digits at PieWidgetUI default percentFormatter

[jantolg]

Description

Related by: https://github.com/CartoDB/carto-react/pull/844

Keep two decimals always in default percent formatters in PieWidgetUI

Type of change

• Fix

Acceptance

Please describe how to validate the feature or fix

1. go to PieWidgetUI
2. Check percents format should have two decimals always, if you didn't defined a different percentFormatter

[github-actions[bot]]

Pull Request Test Coverage Report for Build 8173764685

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 68.561%

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Totals
Change from base Build 8170229593:	0.0%
Covered Lines:	2630
Relevant Lines:	3493

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💛 - Coveralls

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit ade9afa):

https://cartodb-fb-storybook-react-dev--pr850-fix-keep-two-dec-zya52p6w.web.app

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