Fix incorrect error code in StartupReplicationOrigin().

ERRCODE_CONFIGURATION_LIMIT_EXCEEDED was used for checksum failure, use
ERRCODE_DATA_CORRUPTED instead.

Reported-by: Tatsuhito Kasahara
Author: Tatsuhito Kasahara
Backpatch-through: 9.6, where it was introduced
Discussion: https://postgr.es/m/CAP0=ZVLHtYffs8SOWcFJWrBGoRzT9QQbk+_aP+E5AHLNXiOorA@mail.gmail.com

src/backend/replication/logical/origin.c

@@ -796,7 +796,7 @@ StartupReplicationOrigin(void)
 	FIN_CRC32C(crc);
 	if (file_crc != crc)
 		ereport(PANIC,
-				(errcode(ERRCODE_CONFIGURATION_LIMIT_EXCEEDED),
+				(errcode(ERRCODE_DATA_CORRUPTED),
 				 errmsg("replication slot checkpoint has wrong checksum %u, expected %u",
 						crc, file_crc)));