Fix copy & paste error in 4f1b890b.

Due to the bug delayed standbys would not delay when applying prepared
transactions.

Discussion: CAB7nPqT6BO1cCn+sAyDByBxA4EKZNAiPi2mFJ=ANeZmnmewRyg@mail.gmail.com

Michael Paquier via Coverity.

src/backend/access/transam/xlog.c

@@ -5534,7 +5534,7 @@ recoveryApplyDelay(XLogReaderState *record)
 	if (XLogRecGetRmid(record) != RM_XACT_ID)
 		return false;
 
-	xact_info = XLogRecGetInfo(record) & XLOG_XACT_COMMIT;
+	xact_info = XLogRecGetInfo(record) & XLOG_XACT_OPMASK;
 
 	if (xact_info != XLOG_XACT_COMMIT &&
 		xact_info != XLOG_XACT_COMMIT_PREPARED)