AP_NavEKF: fixed static const bug

libraries/AP_NavEKF/AP_NavEKF_core.cpp

@@ -4058,8 +4058,8 @@ void NavEKF_core::readHgtData()
         // filtered baro data used to provide a reference for takeoff
         // it is is reset to last height measurement on disarming in performArmingChecks()
         if (!getTakeoffExpected()) {
-            static const float gndHgtFiltTC = 0.5f;
-            static const float dtBaro = msecHgtAvg*1.0e-3f;
+            const float gndHgtFiltTC = 0.5f;
+            const float dtBaro = msecHgtAvg*1.0e-3f;
             float alpha = constrain_float(dtBaro / (dtBaro+gndHgtFiltTC),0.0f,1.0f);
             meaHgtAtTakeOff += (hgtMea-meaHgtAtTakeOff)*alpha;
         } else if (vehicleArmed && getTakeoffExpected()) {