psql: Update \timing also in case of an error

psql: Update \timing also in case of an error

The changes to show all query results (7844c9918) broke \timing output
in case of an error; it didn't update the timing result and showed
0.000 ms.

Fix by updating the timing result also in the error case.  Also, for
robustness, update the timing result any time a result is obtained,
not only for the last, so a sensible value is always available.

Reported-by: Tom Lane <tgl@sss.pgh.pa.us>
Author: Richard Guo <guofenglinux@gmail.com>
Author: Fabien COELHO <coelho@cri.ensmp.fr>
Discussion: https://www.postgresql.org/message-id/3813350.1652111765%40sss.pgh.pa.us