[Toybox] [PATCH] tr.c: added -t option and cleanup up formatting

[Oliver Webb]

Heya, I noticed that tr was in pending, taking a look at the source code.
It doesn't look very unclean, nor does it fail any test cases. The only 2 things
in the TODO are -t and -a. Neither POSIX or GNU tr specify a -a[scii] option.
The name gives a general idea of what it's supposed to do 
(Stop acting utf-8 safe and treat everything as extended ASCII?)

I added in a -t[runcate] option and a corresponding test case.

I also cleaned up some of code (foobar[0] to *foobar, removing sizeof(char), etc)

- Oliver Webb <aquahobbyist at proton.me>
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