Setting: Retain Stripe Data, place in correct spot settings array

[psealock]

Changes proposed in this Pull Request:

Explicitly place the "Retain Stripe Data" setting at the end of the personal_data_retention section of settings instead of appending it as the second to last entry in the settings array.

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• Make sure your changes respect WordPress' coding standards.
• Did you make changes, or create a new .js file? If Gruntfile.js exists in the repo, make sure to run grunt.

Avoids this issue when Core adds additional settings

Test instruction

1. WooCommerce > Settings > Accounts & Privacy
2. The "Retain Stripe Data" should be the last entry in the "Personal data retention" section.

[mikejolley]

LGTM although there seems to be a since tag modified which I'm unsure is correct.

Will defer to @woocommerce/extendables :)

[roykho]

Overall looks good, just some small notes.

[psealock]

Thanks for the feedback @roykho. I addressed the changes you mentioned.