Get rid of the last explicit length in HTML style= attributes.

Even though style=height is not particularly harmful for responsive
design except for very large arguments which don't really occur in
practice, it is not useful either: nobody should use .sp in manual
pages, in particular not with an argument.  Even if somebody does,
ignoring the argument will likely make the output look better rather
than worse.  Consequently, simplify by dropping a useless feature.

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