AP_NavEKF3: correct flag in case of GPS disable

libraries/AP_NavEKF3/AP_NavEKF3_Control.cpp

@@ -561,7 +561,7 @@ void  NavEKF3_core::updateFilterStatus(void)
     filterStatus.flags.takeoff = expectGndEffectTakeoff; // The EKF has been told to expect takeoff and is in a ground effect mitigation mode
     filterStatus.flags.touchdown = expectGndEffectTouchdown; // The EKF has been told to detect touchdown and is in a ground effect mitigation mode
     filterStatus.flags.using_gps = ((imuSampleTime_ms - lastPosPassTime_ms) < 4000) && (PV_AidingMode == AID_ABSOLUTE);
-    filterStatus.flags.gps_glitching = !gpsAccuracyGood && (PV_AidingMode == AID_ABSOLUTE); // GPS glitching is affecting navigation accuracy
+    filterStatus.flags.gps_glitching = !gpsAccuracyGood && (PV_AidingMode == AID_ABSOLUTE) && (frontend->_fusionModeGPS != 3); // GPS glitching is affecting navigation accuracy
 }
 
 #endif // HAL_CPU_CLASS