minor fix: get object by reference

Source/SenseGloveTracking/Private/SGTracking/SGXRTracker.cpp

@@ -1487,7 +1487,7 @@ void FSGXRTracker::FImpl::BuildMotionSourceToKeypointMap()
             RightLegacyControllerHandTrackingMotionSourceName, FSGMotionSourceInfo(EHandKeypoint::Wrist, false));
     }
 
-    FSGWristTrackingSettings WristTrackingSettings{GetWristTrackingSettings()};
+    const FSGWristTrackingSettings& WristTrackingSettings{GetWristTrackingSettings()};
     const FName LeftHandSGMotionSourceName{
         GetEControllerHandEnumName(WristTrackingSettings.LeftHandMotionSource)
     };