pgsql: Update some tests in 013_crash_restart.pl.

Update some tests in 013_crash_restart.pl.

The expected backend message after SIGQUIT changed in commit
7e784d1dc, but we missed updating this test case.  Also, experience
shows that we might sometimes get "could not send data to server"
instead of either of the libpq messages the test is looking for.

Per report from Mark Dilger.  Back-patch to v14 where the
backend message changed.

Discussion: https://postgr.es/m/17BD82D7-49AC-40C9-8204-E7ADD30321A0@enterprisedb.com

Branch
------
REL_14_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/8803df4ea960117f42f38ee82a74e954e72e0339

Modified Files
--------------
src/test/recovery/t/013_crash_restart.pl | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)