Fix column width calculation issue with certain terminal widths

If the reported terminal width is 0 or less than 42, the signed variable
width was set to a negative number that was then assigned to the
unsigned column width becoming a huge number.

Add comments and change logic to better explain what's happening.

Reviewed-by: Tony Hutter <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Philip Pokorny <[email protected]>
Closes #10247 

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