MINOR: htx: Rename HTX_FL_EOI flag into HTX_FL_EOM

The HTX_FL_EOI flag is not well named. For now, it is not very used. But
that will change. It will replace the EOM block. Thus, it is renamed.
diff --git a/src/h2.c b/src/h2.c
index 5b8bf44..c4868dc 100644
--- a/src/h2.c
+++ b/src/h2.c
@@ -507,7 +507,7 @@
 
 	if (*msgf & H2_MSGF_BODY_TUNNEL) {
 		/* Add the EOM for tunnel requests (CONNECT) */
-		htx->flags |= HTX_FL_EOI; /* no more message data are expected */
+		htx->flags |= HTX_FL_EOM; /* no more message data are expected */
 		if (!htx_add_endof(htx, HTX_BLK_EOM))
 			goto fail;
 	}
@@ -720,7 +720,7 @@
 
 	if (*msgf & H2_MSGF_BODY_TUNNEL) {
 		/* Tunnel sucessfully established, add the EOM now, all data are part of the tunnel */
-		htx->flags |= HTX_FL_EOI; /* no more message data are expected */
+		htx->flags |= HTX_FL_EOM; /* no more message data are expected */
 		if (!htx_add_endof(htx, HTX_BLK_EOM))
 			goto fail;
 	}