[SYCL][NFC] Align nd_item members with constructor initialization list (#1521)

Signed-off-by: Alexey Bader <[email protected]>

Author: bader

sycl/include/CL/sycl/nd_item.hpp

@@ -161,8 +161,8 @@ template <int dimensions = 1> class nd_item {
       : globalItem(GL), localItem(L), Group(GR) {}
 
 private:
-  item<dimensions, false> localItem;
   item<dimensions, true> globalItem;
+  item<dimensions, false> localItem;
   group<dimensions> Group;
 };
 } // namespace sycl