Fix HistogramWidget with one non-zero bucket

[zbigg]

Description

Shortcut: https://app.shortcut.com/cartoteam/story/439218

Fix HistogramWidgetUI component to support case, where there is only one non-zero bucket but ticks and range is proper (min != max).

Fixes regression introduced in #653, where support for uniform values case was too broad:
By uniform values it means:

• all values same,
• so min === max,
• so all ticks are equal (and only last value matters condition was too wide.

Note, original case from #653 where column has uniform value was tested in builder.

Stories for a test.

Type of change

• Fix

Acceptance

1. Go to storybook for HistogramWidgetUI.
2. Change all but one data entries to 0
3. Widget should render properly with one bar.

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 10812628010

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.006%) to 70.958%

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Totals
Change from base Build 10792833099:	-0.006%
Covered Lines:	2839
Relevant Lines:	3682

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💛 - Coveralls

[github-actions]

Visit the preview URL for this PR (updated for commit 6c97ebb):

https://cartodb-fb-storybook-react-dev--pr901-bug-sc-439218-ux-6as5rtou.web.app

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[jmgaya]

LGTM 🚀