[Toybox] [PATCH] id.c: fix -nG.

[enh]

The previous patch broke -nG, so move the -G code back to showone()
which handles -n.

Add the missing tests for the various uses of -n.

Also refactor the code to avoid the need to test optflags directly.
---
 tests/id.test   |  3 +++
 toys/posix/id.c | 65 +++++++++++++++++++++++++++----------------------
 2 files changed, 39 insertions(+), 29 deletions(-)
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