[NFC] polish colossalai/kernel/cuda_native/csrc/kernels/dropout_kernels.cu code style (#1261)

Co-authored-by: “Arsmart123 <202476410arsmart@gmail.com>

colossalai/kernel/cuda_native/csrc/kernels/dropout_kernels.cu

+#include <cooperative_groups.h>
+
 #include <chrono>
 #include <ctime>
 
 #include "kernels.h"
 
-#include <cooperative_groups.h>
-
-
 namespace cg = cooperative_groups;
 
 curandStatePhilox4_32_10_t *curandstate;