[Toybox] [PATCH] test applet, fix issues with the NOT operator

[darken]

Issue 1:
If the "!" operator was not used in the `test` applets argument,
`int not` was never initialized before using it in `toys.exitval ^= not`,
According to a quick search the behavior of `not` is then undefined,
which could lead to inconsistent results (e.g. unexpected result inversion).

Issue 2:
The ! operator was being ignored if we return early due to the target not
existing.

Matthias

(first patch via mailing list, am I doing it right?)
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