fix(nimble): Remove unused constructor

Author: lucasssvaz

libraries/BLE/src/BLEDescriptor.h

@@ -163,7 +163,6 @@ class BLEDescriptorCallbacks {
    *                           Common public declarations                    *
    ***************************************************************************/
 
-  BLEDescriptorCallbacks();
   virtual ~BLEDescriptorCallbacks();
   virtual void onRead(BLEDescriptor *pDescriptor);
   virtual void onWrite(BLEDescriptor *pDescriptor);