Improve coding of column-name parsing in psql's new crosstabview.c.

Coverity complained about this code, not without reason because it was
rather messy.  Adjust it to not scribble on the passed string; that adds
one malloc/free cycle per column name, which is going to be insignificant
in context.  We can actually const-ify both the string argument and the
PGresult.

Daniel Verité, with some further cleanup by me

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