Fix all uninitialized variable warnings (C26495)

Source/Core/InputCommon/ControllerInterface/DInput/DInputJoystick.cpp

@@ -177,9 +177,6 @@ Joystick::Joystick(const LPDIRECTINPUTDEVICE8 device) : m_device(device)
     InitForceFeedback(m_device, num_ff_axes);
   }
 
-  // Zero inputs:
-  m_state_in = {};
-
   // Set hats to center:
   // "The center position is normally reported as -1" -MSDN
   std::fill(std::begin(m_state_in.rgdwPOV), std::end(m_state_in.rgdwPOV), -1);