Fix stylecheck problem encountered by Travis build
Fix stylecheck problem encountered by Travis build

Due to commit https://github.com/pallets/werkzeug/commit/c4b4c52e1d9acbb1bee5b86093eba082fb250c68 the Travis stylecheck build has been failing with the following:

```python
stylecheck runtests: commands[0] | flake8
./bench/wzbench.py:464:37: E251 unexpected spaces around keyword / parameter equals
./bench/wzbench.py:464:39: E251 unexpected spaces around keyword / parameter equals
ERROR: InvocationError for command '/home/travis/build/pallets/werkzeug/.tox/stylecheck/bin/flake8' (exited with code 1)
```
mitsuhiko/werkzeug,pallets/werkzeug,fkazimierczak/werkzeug,pallets/werkzeug,mitsuhiko/werkzeug,fkazimierczak/werkzeug,pallets/werkzeug,fkazimierczak/werkzeug