Revert "psql: Show all query results by default"

This reverts commit 3a51306722.

Per discussion, this patch had too many issues to resolve at this
point of the development cycle.  We'll try again in the future.

Discussion: https://www.postgresql.org/message-id/flat/alpine.DEB.2.21.1904132231510.8961@lancre

contrib/pg_stat_statements/expected/pg_stat_statements.out

@@ -50,28 +50,8 @@ BEGIN \;
 SELECT 2.0 AS "float" \;
 SELECT 'world' AS "text" \;
 COMMIT;
- float 
--------
-   2.0
-(1 row)
-
- text  
--------
- world
-(1 row)
-
 -- compound with empty statements and spurious leading spacing
 \;\;   SELECT 3 + 3 \;\;\;   SELECT ' ' || ' !' \;\;   SELECT 1 + 4 \;;
- ?column? 
-----------
-        6
-(1 row)
-
- ?column? 
-----------
-   !
-(1 row)
-
  ?column? 
 ----------
         5
@@ -81,11 +61,6 @@ COMMIT;
 SELECT 1 + 1 + 1 AS "add" \gset
 SELECT :add + 1 + 1 AS "add" \;
 SELECT :add + 1 + 1 AS "add" \gset
- add 
------
-   5
-(1 row)
-
 -- set operator
 SELECT 1 AS i UNION SELECT 2 ORDER BY i;
  i