emit "ECDHE" instead of "EECDH" for kX packet trace output

other parts of packet tracing emit the standard "ECDHE" label instead
of "EECDH".  This change brings the output of ssl_print_client_keyex()
and ssl_print_server_keyex() into accordance with the standard term.
diff --git a/ssl/t1_trce.c b/ssl/t1_trce.c
index 6856898..751e0ff 100644
--- a/ssl/t1_trce.c
+++ b/ssl/t1_trce.c
@@ -817,7 +817,7 @@
 		}
 	if (alg_k & SSL_kEECDH)
 		{
-		*pname = "EECDH";
+		*pname = "ECDHE";
 		return SSL_kEECDH;
 		}
 	if (alg_k & SSL_kECDHr)