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Schnapps checks hardcoded mountpoint for quota support
**Current behaviour:** schnapps [checks](https://gitlab.nic.cz/turris/schnapps/-/blob/master/schnapps.sh#L159) `/` for quota support. **Expected behaviour:** schnapps uses `"$TMP_MNT_DIR"` to account for mountpoints other than `/`. I wanted to provide a merge requests but looks like I'm missing required permissions. This issue was discussed on the [forum](https://forum.turris.cz/t/possible-bug-in-schnapps-cant-change-the-root-directory-with-d/14564/11).
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