Add FT991UNI to yaesu model list

rigs/yaesu/yaesu.c

@@ -55,6 +55,7 @@ static const struct yaesu_id yaesu_id_list[] =
 {
     { RIG_MODEL_FT1000D, 0x10, 0x21 }, /* or 0x10, 0x00 ? */
     { RIG_MODEL_FT990, 0x09, 0x90 },
+    { RIG_MODEL_FT990UNI, 0x09, 0x90 },
     { RIG_MODEL_FT890, 0x08, 0x41 },
     { RIG_MODEL_FRG100, 0x03, 0x92 }, /* TBC, inconsistency in manual */
     { RIG_MODEL_FT1000MP, 0x03, 0x93 },