fix(treemap-v2): color scheme not work when there is only one dimension

[stephenLYZ]

SUMMARY

The scenario for this PR fix is that changing color scheme in treemap v2 does not see any change if there is only one dimension.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

before

Tree.Layout.mp4

after

2022-07-11.11.33.08.mov

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

[codecov]

Codecov Report

Merging #20671 (4e0972d) into master (c29261b) will not change coverage.
The diff coverage is n/a.

❗ Current head 4e0972d differs from pull request most recent head 36c5252. Consider uploading reports for the commit 36c5252 to get more accurate results

@@           Coverage Diff           @@
##           master   #20671   +/-   ##
=======================================
  Coverage   66.85%   66.85%           
=======================================
  Files        1753     1753           
  Lines       65823    65823           
  Branches     7007     7007           
=======================================
  Hits        44005    44005           
  Misses      20032    20032           
  Partials     1786     1786           

Flag	Coverage Δ
javascript	51.94% <ø> (ø)

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Impacted Files	Coverage Δ
...plugin-chart-echarts/src/Treemap/transformProps.ts	51.51% <ø> (ø)

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