[Bugfix] Fix mismatched nvfp4 gemm output shape (#29742)

Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn>

vllm/model_executor/layers/quantization/compressed_tensors/schemes/compressed_tensors_w4a4_nvfp4.py

@@ -184,7 +184,7 @@ class CompressedTensorsW4A4Fp4(CompressedTensorsScheme):
             return out
 
         output_dtype = x.dtype
-        output_shape = [x.shape[0], layer.weight_packed.shape[0]]
+        output_shape = [*x.shape[:-1], layer.weight_packed.shape[0]]
 
         # quantize BF16 or FP16 to (FP4 and interleaved block scale)
         x_fp4, x_blockscale = scaled_fp4_quant(x, layer.input_global_scale)