Inconsistent power off button in top-right corner across different hardware

On my two laptops I see no “power off” button in the very top-right corner of Tails 3.5 where the battery icon is.
- If I remove the battery from my laptop I get a “power off” button instead of the battery icon.
- On virtual machines, Alan sees a “power off” button instead of the battery icon.

Foundations team: Why is this inconsistent? Always showing a “power off” button would be useful for people who are new to Tails. During the Additional Software UX sprint, at least 3 people out of 7 had an issue with that.

Related issues

Blocks #14761 (closed)

Original created by @sajolida on 15269 (Redmine)

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