Remove powerstat from TX-500 -- was always responding PS0;

https://github.com/Hamlib/Hamlib/issues/1188

rigs/kenwood/tx500.c

@@ -318,8 +318,8 @@ const struct rig_caps tx500_caps =
     .set_channel = ts2000_set_channel,
     .set_trn =  kenwood_set_trn,
     .get_trn =  kenwood_get_trn,
-    .set_powerstat =  kenwood_set_powerstat,
-    .get_powerstat =  kenwood_get_powerstat,
+    //.set_powerstat =  kenwood_set_powerstat,
+    //.get_powerstat =  kenwood_get_powerstat,
     .get_info =  kenwood_get_info,
     .reset =  kenwood_reset,
     .hamlib_check_rig_caps = HAMLIB_CHECK_RIG_CAPS