`enum`s indent by only a single space but should indent by 4

[eureka-cpu]

Currently this:

enum Color {
    Blue : (),
    Green : (),
    Red : (),
    Silver : (),
    Grey : (),
}

formats to this:

enum Color {
 Blue : (),
 Green : (),
 Red : (),
 Silver : (),
 Grey : (),
}

[kayagokalp]

I believe this is closed by #2044