[CodeStyle][W191][E101] remove tabs in python NPU unittest files

[SigureMo]

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• Flake8 tracking issue: [CodeStyle] Flake8 tracking issue #46039

修复 remove-tabs 存量 python 代码（'\t' -> ' ' * 4）

本 PR 仅修复 NPU 单测的问题，触发 NPU 单测以复现单测中出现的问题

[paddle-bot]

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[SigureMo]

2022-09-20 18:48:48 Error: Can not import paddle core while this file exists: /workspace/npu_dev/Paddle/build/python/paddle/fluid/libpaddle.so
2022-09-20 18:48:48 Traceback (most recent call last):
2022-09-20 18:48:48   File "/workspace/npu_dev/Paddle/tools/test_runner.py", line 20, in <module>
2022-09-20 18:48:48     import paddle
2022-09-20 18:48:48   File "/workspace/npu_dev/Paddle/build/python/paddle/__init__.py", line 25, in <module>
2022-09-20 18:48:48     from .framework import monkey_patch_variable
2022-09-20 18:48:48   File "/workspace/npu_dev/Paddle/build/python/paddle/framework/__init__.py", line 17, in <module>
2022-09-20 18:48:48     from . import random  # noqa: F401
2022-09-20 18:48:48   File "/workspace/npu_dev/Paddle/build/python/paddle/framework/random.py", line 16, in <module>
2022-09-20 18:48:48     import paddle.fluid as fluid
2022-09-20 18:48:48   File "/workspace/npu_dev/Paddle/build/python/paddle/fluid/__init__.py", line 36, in <module>
2022-09-20 18:48:48     from . import framework
2022-09-20 18:48:48   File "/workspace/npu_dev/Paddle/build/python/paddle/fluid/framework.py", line 37, in <module>
2022-09-20 18:48:48     from . import core
2022-09-20 18:48:48   File "/workspace/npu_dev/Paddle/build/python/paddle/fluid/core.py", line 301, in <module>
2022-09-20 18:48:48     raise e
2022-09-20 18:48:48   File "/workspace/npu_dev/Paddle/build/python/paddle/fluid/core.py", line 247, in <module>
2022-09-20 18:48:48     from . import libpaddle
2022-09-20 18:48:48 ImportError: libpython3.7m.so.1.0: cannot open shared object file: No such file or directory

看样子可能是 #46095 整合 core_avx 和 core_noavx 到 libpaddle 导致的，但具体原因不太清楚

[luotao1]

请 @qili93 帮忙看下NPU的问题