Fix FT450 and FT991 RIG_LEVEL_NR values

https://github.com/Hamlib/Hamlib/issues/1305

rigs/yaesu/ft450.c

@@ -66,7 +66,6 @@ const struct rig_caps ft450_caps =
     {
 #include "level_gran_yaesu.h"
         // cppcheck-suppress *
-        [LVL_NR] = { .min = { .f = 1 }, .max = { .f = 11 }, .step = { .f = 1 } },
         [LVL_RAWSTR] = { .min = { .i = 0 }, .max = { .i = 255 } },
         [LVL_CWPITCH] = { .min = { .i = 400 }, .max = { .i = 800 }, .step = { .i = 100 } },
         [LVL_KEYSPD] = { .min = { .i = 4 }, .max = { .i = 60 }, .step = { .i = 1 } },

rigs/yaesu/ft991.c

@@ -163,7 +163,6 @@ const struct rig_caps ft991_caps =
     .has_set_parm =       RIG_PARM_NONE,
     .level_gran = {
 #include "level_gran_yaesu.h"
-        [LVL_NR] = { .min = { .f = 1 }, .max = { .f = 15 }, .step = { .f = 1 } },
     },
     .ctcss_list =         common_ctcss_list,
     .dcs_list =           common_dcs_list,