Remove kwallet from the optdepends

Emil Velikovrequested to merge
xexaxo/chromium:rm-kwallet into main

The respective password storage backend is already pulled via the org.freedesktop.secrets virtual package. Furthermore, kwallet got renamed to kwallet5 about 4 months ago.

So let's just remove it from the optdepends list.

Closes: #4 (closed)

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