compare_all: use printf for sql files

https://forum.travelmapping.net/index.php?topic=4871
...and see how far I can expand out the decimal places after doing so.

```
HD @ 5f46cc76c4b07028f64eb60ecffc8f2447c7d405
UD @ 6ab72734d69d70e5828b9db2361389e8a349b5fe
```