Fixed dialyzer errors

```
  make dialyzer
    Checking whether the PLT is up-to-date... yes
    Proceeding with analysis... done in 0m1.27s
  done (passed successfully)
```

And also fixed some styling issues
Line 155 is too long: "    [gen_server:reply(From, Agent) || {From, Agent} <- mas_misc_util:shortest_zip(Froms, Agents)],".