Fix Self-Assignment in CUDA Stream Parameter in renderer.forward.device.h

Summary: Resolved self-assignment warnings in the `renderer.forward.device.h` file by removing redundant assignments of the `stream` variable to itself in `cub::DeviceSelect::Flagged` function calls. This change eliminates compiler errors and ensures cleaner, more efficient code execution.

Reviewed By: bottler

Differential Revision: D76554140

fbshipit-source-id: 28eae0186246f51a8ac8002644f184349aa49560

Author: wenxin0319

pytorch3d/csrc/pulsar/gpu/commands.h

@@ -417,7 +417,7 @@ __device__ static float atomicMin(float* address, float val) {
       (OUT_PTR),              \
       (NUM_SELECTED_PTR),     \
       (NUM_ITEMS),            \
-      stream = (STREAM));
+      (STREAM));
 
 #define COPY_HOST_DEV(PTR_D, PTR_H, TYPE, SIZE) \
   HANDLECUDA(cudaMemcpy(                        \