Fix Gather parameter substitution logic

[PINTO0309]

1. Content and background

• Improved conversion stability when multiple undefined dimensions exist in the input tensor.
• Gather
  • Fix parameter substitution logic.
  • retinaface_onnx_dynamic.onnx.zip
  • https://github.com/PINTO0309/onnx2tf/blob/main/json_samples/replace_retinaface_dynamic_shape.json

    onnx	tflite

• onnx2tf.py
  • Fix parameter replacement logic.
• Concat, common_functions.py
  • Added the ability to swap axes using Gather instead of Transpose when the tensor to be concatenated is a 1D tensor.

2. Summary of corrections

3. Before/After (If there is an operating log that can be used as a reference)

4. Issue number (only if there is a related issue)

• Cannot use converted model with dynamic input shape #521