[Toybox] [PATCH] id: various fixes.

[enh]

Handle unknown groups (fixes #117).

Fix -G to show *all* groups, not just all supplementary groups.

Fix -Z output to not include "context=".
---
 tests/id.test   |  3 +++
 toys/posix/id.c | 53 +++++++++++++++++++++----------------------------
 2 files changed, 26 insertions(+), 30 deletions(-)
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