Comment out line that creates mo_development db
Comment out line that creates mo_development db

- This line causes a fatal error in GitHub Actions.
```
ERROR 1045 (28000): Access denied for user 'mo'@'localhost' (using password: YES)
```
It caused the same error in Travis. See https://app.travis-ci.com/github/MushroomObserver/mushroom-observer/builds/239510359 (Expand ./script/travis_setup).
But in Travis the error ddid not stop the build, which completed successfully.
So why do we need the line>

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