Make the confirmation more scary when reinstalling a USB stick that has a Persistent Storage

Right now, the experience when upgrading and reinstalling from Tails Installer is too similar:

vs.

We could instead:

Remove the confirmation dialog when upgrading.

Make the confirmation dialog more scary when reinstalling:

Without Persistent Storage on the target USB stick:

**Confirm the target USB stick**

⚠

15.5 GB TOSHIBA TransMemory device (/dev/sda1)

All data on this USB stick will be lost.

[Cancel] [Delete All Data and Install]

With a Persistent Storage on the target USB stick:

**Confirm the target USB stick**

⚠

15.5 GB TOSHIBA TransMemory device (/dev/sda1)

The Persistent Storage on this USB stick will be lost.

[Cancel] [Delete Persistent Storage and Reinstall]

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