Mostly-cosmetic adjustments to estimate_multivariate_bucketsize().HEADmaster

The only practical effect of these changes is to avoid a useless
list_copy() operation when there is a single hashclause.  That's
never going to make any noticeable performance difference, but
the code is arguably clearer this way, especially if we take the
opportunity to add some comments so that readers don't have to
reverse-engineer the usage of these local variables.  Also add
some braces for better/more consistent style.

Author: Tender Wang <tndrwang@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CAHewXNnHBOO9NEa=NBDYOrwZL4oHu2NOcTYvqyNyWEswo8f5OQ@mail.gmail.com

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