WipeComplete screen shows same message for both local and remote wiping

In either case, the message says: 'Next time you have access to your Briar device, please open the Mailbox settings screen in the Briar app, then tap the "Unlink" button to complete the process'. That could potentially be confusing for the user in the case of a remote wipe as this step is no longer possible and actually already happened.

Test instructions: with Briar and Mailbox successfully linked, wipe once locally and once remotely from Briar (link the apps again after the first wiping). Check that when wiping locally (i.e. from the Mailbox app's status screen), the confirmation screen shows an explainer text to wipe on Briar later on too. When wiping remotely (from Briar's mailbox status screen) check that the confirmation screen on the Mailbox app does not contain the explainer.