input_retro: always use hat1 for d-pad in joystick configure

Joystick device's configure used hat1 + n, n being index of currently
configured joystick, for d-pad. Because of this in Batocera.linux
running on rk3399 arm board d-pad didn't work except for the first
player when using two Logitech gamepads. Interestingly this did not
happen on x86 linux desktop where same gamepads worked correctly without
this patch and I have no idea why.

Fixed by using hat1 for all configured joystick devices. D-pad mapping
still works correctly for two gamepads on x86 linux desktop too.

src/osd/modules/input/input_retro.cpp

@@ -1228,28 +1228,28 @@ class retro_joystick_device : public event_based_device<KeyPressEventArgs>, prot
 		switch_ids[SWITCH_DPAD_UP] = device.add_item(
 			Buttons_Name[RETROPAD_PAD_UP],
 			std::string_view(),
-			static_cast<input_item_id>(ITEM_ID_HAT1UP + joy_count*4),
+			ITEM_ID_HAT1UP,
 			generic_button_get_state<std::uint8_t>,
 			&joystate[joy_count].button[RETROPAD_PAD_UP]);
 
 		switch_ids[SWITCH_DPAD_DOWN] = device.add_item(
 			Buttons_Name[RETROPAD_PAD_DOWN],
 			std::string_view(),
-			static_cast<input_item_id>(ITEM_ID_HAT1DOWN + joy_count*4),
+			ITEM_ID_HAT1DOWN,
 			generic_button_get_state<std::uint8_t>,
 			&joystate[joy_count].button[RETROPAD_PAD_DOWN]);
 
 		switch_ids[SWITCH_DPAD_LEFT] = device.add_item(
 			Buttons_Name[RETROPAD_PAD_LEFT],
 			std::string_view(),
-			static_cast<input_item_id>(ITEM_ID_HAT1LEFT + joy_count*4),
+			ITEM_ID_HAT1LEFT,
 			generic_button_get_state<std::uint8_t>,
 			&joystate[joy_count].button[RETROPAD_PAD_LEFT]);
 
 		switch_ids[SWITCH_DPAD_RIGHT] = device.add_item(
 			Buttons_Name[RETROPAD_PAD_RIGHT],
 			std::string_view(),
-			static_cast<input_item_id>(ITEM_ID_HAT1RIGHT + joy_count*4),
+			ITEM_ID_HAT1RIGHT,
 			generic_button_get_state<std::uint8_t>,
 			&joystate[joy_count].button[RETROPAD_PAD_RIGHT]);