bugfix: wireshark improperly parsing features_repl

It thought there were 13 OF actions, but there
are really 12 b/c vendor type doesn't count.

Sanity checked by grg

utilities/wireshark_dissectors/openflow/packet-openflow.c

@@ -109,7 +109,7 @@ static const value_string names_ofp_action_type[] = {
     { OFPAT_VENDOR,       "Vendor-defined action"},
     { 0,                  NULL }
 };
-#define NUM_ACTIONS_FLAGS 13
+#define NUM_ACTIONS_FLAGS 12
 #define NUM_PORT_CONFIG_FLAGS 7
 #define NUM_PORT_STATE_FLAGS 1
 #define NUM_PORT_FEATURES_FLAGS 12