docker-compose.yml: Sanitize whitespace usage
I noted when looking at the file that it was a bit messy because it used a mix of 2 and 4 spaces as indentation width in the YAML. [yamllint](https://github.com/adrienverge/yamllint) also showed warnings about the same things. I cleaned the file up, so that the indentation would be harmonized and give people a better first impression of a great tool (=buildbot).
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