Initialize pidGainsUpdateRequired to true for proper PID gain updates

Author: shota3527

src/main/flight/pid.c

@@ -126,7 +126,7 @@ static EXTENDED_FASTRAM pt1Filter_t headingHoldRateFilter;
 static EXTENDED_FASTRAM pt1Filter_t fixedWingTpaFilter;
 
 // Thrust PID Attenuation factor. 0.0f means fully attenuated, 1.0f no attenuation is applied
-STATIC_FASTRAM bool pidGainsUpdateRequired;
+STATIC_FASTRAM bool pidGainsUpdateRequired= true;
 FASTRAM int16_t axisPID[FLIGHT_DYNAMICS_INDEX_COUNT];
 
 #ifdef USE_BLACKBOX