Bugfix to quantizer test

[kawakami-masaki0]

Pull Request Description:

Quantization tests fail if the random input tensors (range -50~50) ​​are only positive or negative.
Bugfix to generate input tensors ​​that contain both positive and negative values.

Checklist before requesting a review:

• I set the appropriate labels on the pull request.
• I have added/updated the release note draft (if necessary).
• I have updated the documentation to reflect my changes (if necessary).
• All function and files are well documented.
• All function and classes have type hints.
• There is a licenses in all file.
• The function and variable names are informative.
• I have checked for code duplications.
• I have added new unittest (if necessary).

[yt0705]

There still seem to be some corrections missing.

for example
tests/keras_tests/quantizers_tests/test_weights_inferable_quantizer.py