Fixing button label for E2E tests for onboarding

[grzegorz-cp]

Fixes JETPACK-431

Proposed changes:

• fixing E2E tests after button change from "Approve" to "Connect my site" (Release user connection redesign wp-calypso#103145)

Other information:

• Have you written new tests for your changes, if applicable?
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Testing instructions:

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[gmjuhasz]

Tests pass, looks good!