Simplify psql \d's rule for ordering the indexes of a table.

 Simplify psql \d's rule for ordering the indexes of a table.
 
 The previous rule was "primary key (if any) first, then other unique
 indexes in name order, then all other indexes in name order".
 But the preference for unique indexes seems a bit obsolete since the
 introduction of exclusion constraints.   It's no longer the case
 that unique indexes are the only ones that constrain what data can
 be in the table, and it's hard to see what other rationale there is
 for separating out unique indexes.  Other new features like the
 possibility for some indexes to be INVALID (hence, not constraining
 anything) make this even shakier.
 
 Hence, simplify the sort order to be "primary key (if any) first,
 then all other indexes in name order".
 
 No documentation change, since this was never documented anyway.
 A couple of existing regression test cases change output, though.
 
 Discussion: https://postgr.es/m/14422.1561474929@sss.pgh.pa.us