disable i32 index for webgpu for now [no ci]

Author: CISC

ggml/src/ggml-webgpu/ggml-webgpu.cpp

@@ -1310,7 +1310,7 @@ static bool ggml_backend_webgpu_device_supports_op(ggml_backend_dev_t dev, const
             break;
         case GGML_OP_CPY:
         case GGML_OP_SET_ROWS:
-            supports_op = (op->type == GGML_TYPE_F16 && op->src[0]->type == GGML_TYPE_F32);
+            supports_op = (op->type == GGML_TYPE_F16 && op->src[0]->type == GGML_TYPE_F32 && op->src[1]->type == GGML_TYPE_I64);
             break;
         case GGML_OP_GET_ROWS:
             if (op->src[0]->type == GGML_TYPE_F32 || op->src[0]->type == GGML_TYPE_F16 ||