Fix: restore lowercase "native transfer"

[katspaugh]

What it solves

Lowercase "native transfer" was capitalized in #3760 but it's not consistent with other tx types in decoded multisends.

How this PR fixes it

Restores it to how it was.

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Branch preview

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Website: https://native_transfer--walletweb.review.5afe.dev/home?safe=eth:0xA77DE01e157f9f57C7c4A326eeE9C4874D0598b6

Storybook: https://native_transfer--walletweb.review.5afe.dev/storybook/

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ESLint Summary View Full Report

Annotations are provided inline on the Files Changed tab. You can also see all annotations that were generated on the annotations page.

Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: :white_check_mark: success
  • Annotations: 0 total

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^{Report generated by eslint-plus-action}

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📦 Next.js Bundle Analysis for safe-wallet-web

This analysis was generated by the Next.js Bundle Analysis action. 🤖

🎉 Global Bundle Size Decreased

Page	Size (compressed)
global	950.6 KB (-3 B)

Details

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Coverage report

St.:grey_question:	Category	Percentage	Covered / Total
🟡	Statements	79.49%	11533/14509
🔴	Branches	58.55%	2776/4741
🟡	Functions	66.76%	1854/2777
🟢	Lines	80.84%	10404/12870

Test suite run success

1449 tests passing in 199 suites.

Report generated by 🧪jest coverage report action from 60c1db80d566d818e5d56cb9e3e8cfc553c46808