POS: Fix duplicate error localization identifiers

[staskus]

Description

Duplicate error localization identifiers cause identical POS button titles.

Solution

Change both identifiers to avoid ambiguities.

Testing information

The easiest way to test the issue is to add products worth above $1M.

Screenshots

Before

After

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• [x] I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• [x] The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• [x] Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• [x] Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on all devices (phone/tablet) and no regressions are added.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce iOS by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS
	Build Number	pr14398-914ea71
	Version	21.1
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	914ea71c98b767e01b8778f768d996195f46d514
	App Center Build	WooCommerce - Prototype Builds #11556

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