[Toybox] [PATCH] ps: don't query for terminal size if not a tty

[Josh Gao]

>From an internal bug:

    $ adb shell
    # set terminal width to 68 chars
    sailfish:/ $ ps -A | grep init
    root             1     0   12344   1556 SyS_epoll+          0 S init
    # reduce terminal width to 67 chars
    sailfish:/ $ ps -A | grep init
    1|sailfish:/ $

Patch attached to check isatty(1) before getting the terminal size.
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