AP_Baro: removed HIL constructor

this wasn't calling the parent class

libraries/AP_Baro/AP_Baro_HIL.cpp

@@ -5,9 +5,6 @@
 #include <AP_HAL.h>
 extern const AP_HAL::HAL& hal;
 
-// Constructors ////////////////////////////////////////////////////////////////
-AP_Baro_HIL::AP_Baro_HIL(){}
-
 // Public Methods //////////////////////////////////////////////////////////////
 bool AP_Baro_HIL::init()
 {

libraries/AP_Baro/AP_Baro_HIL.h

@@ -16,8 +16,6 @@ private:
     uint8_t _count;
 
 public:
-    AP_Baro_HIL();  // Constructor
-
     bool init();
     uint8_t read();
     float get_pressure();