[Hint Mode: Start Coords] Correct flag logic for polygon graph start coords UI

[nishasy]

Summary:

I noticed that the "Reset to default coordinates" button still shows up for
polygon graphs with unlimited sides, but it's not supposed to. I figured out
that this is because I accidentally used numPoints instead of numSides in
the logic.

• Fix the flags logic
• Add tests

Issue: https://khanacademy.atlassian.net/browse/LEMS-2072

Test plan:

yarn jest packages/perseus-editor/src/widgets/__tests__/interactive-graph-editor.test.tsx

Storybook

• Go to http://localhost:6006/?path=/story/perseuseditor-widgets-interactive-graph--interactive-graph-polygon
• Set number of sides to "unlimited sides"
• Confirm that the start coords UI no longer shows up

[github-actions]

Size Change: +3 B (0%)

Total Size: 853 kB

Filename	Size	Change
packages/perseus-editor/dist/es/index.js	273 kB	+3 B (0%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.3 kB
packages/kmath/dist/es/index.js	4.27 kB
packages/math-input/dist/es/index.js	80.8 kB
packages/math-input/dist/es/strings.js	1.73 kB
packages/perseus-core/dist/es/index.js	1.48 kB
packages/perseus-linter/dist/es/index.js	21.6 kB
packages/perseus/dist/es/index.js	413 kB
packages/perseus/dist/es/strings.js	3.29 kB
packages/pure-markdown/dist/es/index.js	3.67 kB
packages/simple-markdown/dist/es/index.js	12.4 kB

_{compressed-size-action}

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/clean-glasses-watch.md, packages/perseus-editor/src/components/util.ts, packages/perseus-editor/src/widgets/__tests__/interactive-graph-editor.test.tsx

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.55%. Comparing base (0bec013) to head (408917e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1491      +/-   ##
==========================================
+ Coverage   70.07%   70.55%   +0.47%     
==========================================
  Files         510      513       +3     
  Lines      105646   105683      +37     
  Branches     5413    10827    +5414     
==========================================
+ Hits        74035    74565     +530     
+ Misses      31494    31118     -376     
+ Partials      117        0     -117     

Files	Coverage Δ
packages/perseus-editor/src/components/util.ts	85.07% <100.00%> (ø)

... and 137 files with indirect coverage changes

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[benchristel]

Good catch! LGTM.