Fix fused_moe import for non-NPU devices (#25076)

Co-authored-by: Brayden Zhong <b8zhong@uwaterloo.ca>

python/sglang/srt/models/afmoe.py

@@ -62,9 +62,7 @@ from sglang.srt.utils import add_prefix, is_npu
 
 _is_npu = is_npu()
 
-if not _is_npu:
-    from sglang.srt.layers.moe.fused_moe_triton import fused_moe
-else:
+if _is_npu:
     from sglang.srt.hardware_backend.npu.quantization.fused_moe_method_npu import (
         fused_moe_npu as fused_moe,
     )