Change quantization of test codes to default value. (#1655)

Change quantization of test codes to default value. (#1655)

In case of the scalars and non-fixed point tensors, scale value is changed to 0.0f by TFLite because it is not used.
However in TFLITE, scale value of TENSOR_INT32 is passed on to the runtime and may be used depending on each operation.
So This commit set scale value to default value(0.0f) in order to clarify the value is not used.

Signed-off-by: jiseob.jang <jiseob.jang@samsung.com>