Fix anaerobic digester

[osuphobia]

Summary

Bugfixes "Fix anaerobic digester"

Purpose of change

Fix #73509.

Describe the solution

Fixed the compost_full function, now the loop in Character::i_add_or_drop will not be called again and again.
Also fixed some typo or minor mistakes in comment and description, and deconstruct result of the digester (forgot to change it to the correct result when adding the contents).

Describe alternatives you've considered

N/A

Testing

Follow the steps to reproduce the bug, game will not freeze or lag now.

Additional context

N/A

[osuphobia]

Oops, forgot to check it without debug pocket, seems that the function will not work as expected after the fix.
This needs further modification🤐

[osuphobia]

It should be ok now, but we do need something like the liquid_handler but for gases.