Inconsistent indenation in for comprehensions

When we indent the for comprehension, because of the comma we get one tab indentation
Like this:

```
for x <- 1..100,
y <- 1..100,
z <- 1..100,
do: {x, y, z}
```

When clearly the default indentation should align all the generators in one line, like this

```
for x <- 1..100,
y <- 1..100,
z <- 1..100,
do: {x, y, z}
```