Fixed default value of the "ess_cert_id_alg" option in man openssl-ts(1)

CLA: trivial

Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #21805)

(cherry picked from commit 5ffad4b)

doc/man1/openssl-ts.pod.in

@@ -490,7 +490,7 @@ Default is no.  (Optional)
 =item B<ess_cert_id_alg>
 
 This option specifies the hash function to be used to calculate the TSA's
-public key certificate identifier. Default is sha256. (Optional)
+public key certificate identifier. Default is sha1. (Optional)
 
 =back