fix(area chart legacy): tool tip shows actual value rather than y axi…

[AkashBoora]

SUMMARY

Tha area chart was showing the decimal values when it is expanded mode rather than actula values. I made changes so that it gonna show the actual value rather than decimal values (these decimal values were representing the percentage of value w.r.t total)

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue: [Chart] Expanded area chart show wrong values in tooltips #20003
• 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 #23469 (efd206f) into master (212b733) will not change coverage.
The diff coverage is n/a.

❗ Current head efd206f differs from pull request most recent head a9dec12. Consider uploading reports for the commit a9dec12 to get more accurate results

@@           Coverage Diff           @@
##           master   #23469   +/-   ##
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  Coverage   67.64%   67.64%           
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  Files        1908     1908           
  Lines       73739    73739           
  Branches     7988     7988           
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  Hits        49879    49879           
  Misses      21814    21814           
  Partials     2046     2046           

Flag	Coverage Δ
javascript	53.82% <ø> (ø)

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Impacted Files	Coverage Δ
...tend/plugins/legacy-preset-chart-nvd3/src/utils.js	15.92% <ø> (ø)

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[villebro]

LGTM, thanks for the fix!