fix(histogram): remove extra single quotes

[rusackas]

SUMMARY

Those quotes shouldn't be there! Fixes #33246

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

After:

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[korbit-ai]

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[korbit-ai]

I've completed my review and didn't find any issues.

Files scanned

​

File Path	Reviewed
superset-frontend/plugins/plugin-chart-echarts/src/Histogram/transformProps.ts	✅

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[srinify]

@rusackas doesn't have to be this PR, but we may also want to update this README in the ECharts plugin folder. It's no longer just the Timeseries and Pie charts anymore: https://github.com/apache/superset/blob/05beb7cc4a5080f38a11fc377a5db7c910850919/superset-frontend/plugins/plugin-chart-echarts/README.md