Do not pretend to default initialize a device lambda

Found in CCCL CI

Author: miscco

cpp/src/prims/count_if_v.cuh

@@ -35,9 +35,9 @@ namespace detail {
 
 template <typename vertex_t, typename VertexValueInputIterator, typename VertexOp>
 struct count_if_call_v_op_t {
-  vertex_t local_vertex_partition_range_first{};
-  VertexValueInputIterator vertex_value_input_first{};
-  VertexOp v_op{};
+  vertex_t local_vertex_partition_range_first;
+  VertexValueInputIterator vertex_value_input_first;
+  VertexOp v_op;
 
   __device__ bool operator()(vertex_t i)
   {