compdb: minor fixes to the COMPDB lump (#2130)

* comvert md5 entries into single-element arrays

* fix the tntr_map30 entry, while at it

* revert converting md5 entries into single-element arrays

* pretty print the base/all-all/compdb.lmp JSON format lump

by piping it through the following code and fixing the missing newline
at the end of the file:

```python
import sys, json
json.dump(json.load(sys.stdin), sys.stdout, indent=2)
```

Author: fabiangreffrath