test: remove redundant color diffing dependency

Description of Change

Follow up to https://github.com/electron/electron/pull/31017 - remove dependency added in https://github.com/electron/electron/pull/32593.

Checklist

• [x] PR description included and stakeholders cc'd
• [x] npm test passes
• [x] tests are changed or added
• [x] PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: none