chore: disable logging all statements by default

We'll be adding docs and dashboard functionality to make it easier to
hook into the more sophisticated logging options offered by pgAudit
instead.

Author: darora

ansible/files/postgresql_config/postgresql.conf.j2

@@ -540,7 +540,7 @@ log_line_prefix = '%h %m [%p] %q%u@%d '		# special values:
 #log_parameter_max_length_on_error = 0	# when logging an error, limit logged
 					# bind-parameter values to N bytes;
 					# -1 means print in full, 0 disables
-log_statement = 'all'			# none, ddl, mod, all
+log_statement = 'none'			# none, ddl, mod, all
 #log_replication_commands = off
 #log_temp_files = -1			# log temporary files equal or larger
 					# than the specified size in kilobytes;