Sub: Don't emit tether turn status via STATUSTEXT

We have NAMED_VALUE_FLOAT do that now

ArduSub/turn_counter.cpp

@@ -53,13 +53,5 @@ void Sub::update_turn_counter()
         }
         break;
     }
-    static int32_t last_turn_count_printed;
-    static uint32_t last_turn_announce_ms = 0;
-    uint32_t tnow = AP_HAL::millis();
-    if (quarter_turn_count/4 != last_turn_count_printed  && tnow > last_turn_announce_ms + 2000) {
-        last_turn_announce_ms = tnow;
-        gcs().send_text(MAV_SEVERITY_INFO,"Tether is turned %i turns %s",int32_t(abs(quarter_turn_count)/4),(quarter_turn_count>0)?"to the right":"to the left");
-        last_turn_count_printed = quarter_turn_count/4;
-    }
     last_turn_state = turn_state;
 }