>= 3s button press leads to hard shutdown

[kdevo]

The 3s long button press always seems to trigger a hard shutdown.

Usually, to check if the last shutdown was clean, we can use the last command, but on tests this did not work, probably because of the Pi's missing hardware clock which leads to the logs getting confused.

Three possible causes:

• My case is defective (e.g. reacting too late)
• The software implementation of this project is faulty
• It's a general problem of the case's hardware