force glove recalibration on backend initialize

Source/SenseGloveBackend/Private/SGBackend/SGBackend.cpp

@@ -42,6 +42,7 @@
 #endif  /* PLATFORM_ANDROID */
 
 #include "SGCore/SGDeviceList.h"
+#include "SGCore/SGHandLayer.h"
 #include "SGLog/SGLog.h"
 
 struct USGBackend::FImpl
@@ -117,6 +118,10 @@ bool USGBackend::InitializeBackend()
         FSGDeviceList::Dispose();
         FSGDeviceList::Reinitialize();
 
+        // Force reset the hands calibration.
+        FSGHandLayer::ResetCalibration(false);
+        FSGHandLayer::ResetCalibration(true);
+
         bBackendInitialized = true;
 
         return true;