AP_NavEKF: Consistently set timeout flags whenever aiding is inhibited

This ensures the position and velocity measurement status will be set as timed out immediately after use of those measurements is inhibited. This will improve the timeliness of filter status reporting.

libraries/AP_NavEKF/AP_NavEKF.cpp

@@ -748,6 +748,8 @@ void NavEKF::SelectVelPosFusion()
                 constVelMode = false; // always clear constant velocity mode if constant velocity mode is active
                 constPosMode = true;
                 PV_AidingMode = AID_NONE;
+                posTimeout = true;
+                velTimeout = true;
                 // reset the velocity
                 ResetVelocity();
                 // store the current position to be used to keep reporting the last known position
@@ -4309,8 +4311,6 @@ void NavEKF::InitialiseVariables()
 
     // initialise other variables
     gpsNoiseScaler = 1.0f;
-    velTimeout = true;
-    posTimeout = true;
     hgtTimeout = true;
     magTimeout = true;
     tasTimeout = true;
@@ -4363,6 +4363,8 @@ void NavEKF::InitialiseVariables()
     lastConstVelMode = false;
     heldVelNE.zero();
     PV_AidingMode = AID_NONE;
+    posTimeout = true;
+    velTimeout = true;
     gpsVelGlitchOffset.zero();
     vehicleArmed = false;
     prevVehicleArmed = false;
@@ -4561,6 +4563,8 @@ void NavEKF::performArmingChecks()
         // set various  useage modes based on the condition at arming. These are then held until the vehicle is disarmed.
         if (!vehicleArmed) {
             PV_AidingMode = AID_NONE; // When dis-armed, we only estimate orientation & height using the constant position mode
+            posTimeout = true;
+            velTimeout = true;
             constPosMode = true;
             constVelMode = false; // always clear constant velocity mode if constant position mode is active
             lastConstVelMode = false;
@@ -4599,6 +4603,8 @@ void NavEKF::performArmingChecks()
     // Always turn aiding off when the vehicle is disarmed
     if (!vehicleArmed) {
         PV_AidingMode = AID_NONE;
+        posTimeout = true;
+        velTimeout = true;
         // set constant position mode if aiding is inhibited
         constPosMode = true;
         constVelMode = false; // always clear constant velocity mode if constant position mode is active