[node] remove incorrect error check

[Yulong Wang (fs-eire)]

Description

remove the code that generates warning.

[6/8] Building CXX object CMakeFiles/o...ing.dir/src/inference_session_wrap.cc.
/s/js/node/src/inference_session_wrap.cc:19:8: warning: reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false [-Wtautological-undefined-compare]
   19 |       &Ort::GetApi() == nullptr, env,
      |        ^~~~~~~~~~~~~    ~~~~~~~
/s/js/node/src/common.h:41:67: note: expanded from macro 'ORT_NAPI_THROW_ERROR_IF'
   41 | #define ORT_NAPI_THROW_ERROR_IF(COND, ENV, ...) ORT_NAPI_THROW_IF(COND, Error, ENV, __VA_ARGS__)
      |                                                                   ^~~~
/s/js/node/src/common.h:38:7: note: expanded from macro 'ORT_NAPI_THROW_IF'
   38 |   if (COND) {                                    \
      |       ^~~~
/s/js/node/../../include/onnxruntime/core/session/onnxruntime_cxx_api.h:189:22: note: 'GetApi' returns a reference
  189 | inline const OrtApi& GetApi() noexcept { return *detail::Global::Api(); }
      |                      ^
1 warning generated.

[Copilot]

Pull Request Overview

This PR removes a defunct API initialization check from the Node.js binding initialization code. The removed check attempted to verify ONNX Runtime API initialization but was ineffective due to checking the address of a reference rather than a pointer.

• Removes an ineffective null-check for the ONNX Runtime API
• Simplifies the initialization flow by removing unreachable error handling

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