WPS318 wrong behaviour for func arguments

[Corrosion667]

What's wrong

PEP8 says that "4 spaces (an extra level of indentation) must be added to distinguish arguments from the rest". But linter accepts only 4 spaces, not 8.

How it should be

Do not consider 8 spaces in function signature as violation/

Flake8 version and plugins

  "dependencies": [],
  "platform": {
    "python_implementation": "CPython",
    "python_version": "3.7.3",
    "system": "Linux"
  },
  "plugins": [
    {
      "is_local": false,
      "plugin": "flake8-bandit",
      "version": "3.0.0"
    },
    {
      "is_local": false,
      "plugin": "flake8-broken-line",
      "version": "0.4.0"
    },
    {
      "is_local": false,
      "plugin": "flake8-bugbear",
      "version": "22.7.1"
    },
    {
      "is_local": false,
      "plugin": "flake8-comprehensions",
      "version": "3.10.0"
    },
    {
      "is_local": false,
      "plugin": "flake8-darglint",
      "version": "1.8.1"
    },
    {
      "is_local": false,
      "plugin": "flake8-debugger",
      "version": "4.1.2"
    },
    {
      "is_local": false,
      "plugin": "flake8-docstrings",
      "version": "1.6.0, pydocstyle: 6.1.1"
    },
    {
      "is_local": false,
      "plugin": "flake8-eradicate",
      "version": "1.3.0"
    },
    {
      "is_local": false,
      "plugin": "flake8-string-format",
      "version": "0.3.0"
    },
    {
      "is_local": false,
      "plugin": "flake8_commas",
      "version": "2.1.0"
    },
    {
      "is_local": false,
      "plugin": "flake8_isort",
      "version": "4.2.0"
    },
    {
      "is_local": false,
      "plugin": "flake8_quotes",
      "version": "3.3.1"
    },
    {
      "is_local": false,
      "plugin": "mccabe",
      "version": "0.6.1"
    },
    {
      "is_local": false,
      "plugin": "naming",
      "version": "0.12.1"
    },
    {
      "is_local": false,
      "plugin": "pycodestyle",
      "version": "2.8.0"
    },
    {
      "is_local": false,
      "plugin": "pyflakes",
      "version": "2.4.0"
    },
    {
      "is_local": false,
      "plugin": "rst-docstrings",
      "version": "0.2.7"
    },
    {
      "is_local": false,
      "plugin": "wemake_python_styleguide",
      "version": "0.16.1"
    }
  ],
  "version": "4.0.1"
}```


### pip information

pip 22.0.4 (python 3.7) alembic==1.8.1 anyio==3.6.1 astor==0.8.1 asyncpg==0.26.0 attrs==22.1.0 bandit==1.7.4 click==8.1.3 darglint==1.8.1 databases==0.6.1 docutils==0.19 eradicate==2.1.0 fastapi==0.79.1 flake8==4.0.1 flake8-bandit==3.0.0 flake8-broken-line==0.4.0 flake8-bugbear==22.7.1 flake8-commas==2.1.0 flake8-comprehensions==3.10.0 flake8-debugger==4.1.2 flake8-docstrings==1.6.0 flake8-eradicate==1.3.0 flake8-isort==4.2.0 flake8-polyfill==1.0.2 flake8-quotes==3.3.1 flake8-rst-docstrings==0.2.7 flake8-string-format==0.3.0 gitdb==4.0.9 GitPython==3.1.27 greenlet==1.1.2 h11==0.13.0 httptools==0.4.0 idna==3.3 importlib-metadata==4.2.0 importlib-resources==5.9.0 isort==5.10.1 Mako==1.2.1 MarkupSafe==2.1.1 mccabe==0.6.1 pbr==5.10.0 pep8-naming==0.12.1 psycopg2-binary==2.9.3 pycodestyle==2.8.0 pydantic==1.9.2 pydocstyle==6.1.1 pyflakes==2.4.0 Pygments==2.13.0 python-dotenv==0.20.0 PyYAML==6.0 restructuredtext-lint==1.4.0 smmap==5.0.0 sniffio==1.2.0 snowballstemmer==2.2.0 SQLAlchemy==1.4.40 starlette==0.19.1 stevedore==3.5.0 typing_extensions==4.3.0 uvicorn==0.18.2 uvloop==0.16.0 watchfiles==0.16.1 websockets==10.3 wemake-python-styleguide==0.16.1 zipp==3.8.1

### OS information

Debian11