Incorrect handling of "Erase in Line" at end of the line

[Yikai Zhao]

Steps to reproduce:

$ echo 0123456789 | grep --color=always 56789 > /tmp/grep.txt
$ ./bin/unterm -c 10 -l 10 /tmp/grep.txt

Actual output:

012345678

Expected output:

0123456789

---

Under the hood, grep produces "01234\33[01;31m\33[K56789\33[m\33[K". It seems that a "Erase in Line" at the end of the line would erase the last character in the line.

[Yikai Zhao (blahgeek)]

`export GREP_COLORS=ne` is a workaround for this issue.