Have a nicer-looking icon for the Persistent Storage

What icon to use

Keeping in mind how the other icons in Favorites look like, as a sample of style:

Right now we have:

I find it too flat and too gray in terms of style. The new design uses a padlock instead of a safe.

The padlock worked fine in usability test and is easier to depict open or close, which was important for the understanding of the encryption.
@segfault implemented in !339:

I find it too detailed for an icon
I only found 1 other icon in GNOME that has a padlock with some depth that we might be able to adapt:

This icon should work in:

The Applications menu to replace the gray safe icon:
On the Welcome Screen when the Persistent Storage does not exist yet:

See https://gitlab.tails.boum.org/tails/blueprints/-/wikis/Persistent-Storage-redesign#welcome-screen.

Maybe using the full image of the backpack is taking too much space or not the right visual treatment.
On the Welcome Screen when the Persistent Storage already exists, both locked and open:

Currently, we have:
The Places menu and sidebar of the Files browser (#18760 (closed))

Edited Dec 27, 2021 by sajolida

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