[Toybox] [PATCH] losetup: minor fixes.

[enh]

Fix `losetup -f` to not fail with an error.

Add the missing \n for `losetup -f --show FILE`.

Use decimal for the device number, like the desktop losetup.

Switch to the FLAG macro.

Make the tests runnable as tests, and expand coverage a bit. With this
patch, the tests pass both with and without TEST_HOST on the desktop.
Note though that this patch is part of fixing some real-life losetup
issues, not part of the "test cleanup" I'm also looking at. losetup is
low down that list!
---
 tests/losetup.test   | 18 +++++++++++-------
 toys/other/losetup.c | 41 ++++++++++++++++++++++++-----------------
 2 files changed, 35 insertions(+), 24 deletions(-)
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