ls: Remove trailing whitespace so that tests pass

When in modes `-C` and `-x` we need to remove the trailing whitespace
on each line. This is the behavior of other `ls` commands.

Other `ls` commands will print the last filename and then print a
newline. Prior to this patch we would print the last filename, followed
by two spaces, and then print a newline.
Previously, we would get to the end of the loop and print the padding.
I couldn't figure out a way to determine when the program had reached
the end of a line. So I piggybacked off of the newline code.

0 files changed, 0 insertions, 0 deletions