AP_TECS: Corrected formula for _TASmin according to fix in formula for the load factor

See details here: ArduPilot#24320

Author: abaghiyan

libraries/AP_TECS/AP_TECS.cpp

@@ -415,7 +415,13 @@ void AP_TECS::_update_speed(float DT)
     if (aparm.stall_prevention) {
         // when stall prevention is active we raise the minimum
         // airspeed based on aerodynamic load factor
-        _TASmin *= _load_factor;
+		/*
+		As load factor formula fixed in ArduPlane Plane::update_load_factor,
+		here also should be changes done according to comments by Peter Hall
+		see issue #24320 [https://github.com/ArduPilot/ardupilot/issues/24320].
+		*/
+		
+        _TASmin *= safe_sqrt(_load_factor);
     }
 
     if (_TASmax < _TASmin) {