top: make the column header span the terminal.

This also makes everything more readable by separating out the -b no
formatting case.

The whitespace trimming for -b isn't strictly necessary, but it looks
weird if we output unnecessary spaces at the end of the line in -b mode,
and we've fixed it before, so let's not regress here. It also seems more
logical to do this in the one place where it actually happens.

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