Formatter adding extra space for struct instantiations

[adlerjohn]

U128 {
    upper, lower, 
}

(note the extra space after lower, !)

This should format each field on a separate line if > 80 chars, or as a single line with no trailing comma if < 80 chars. If you don't want to do the character count logic, then just each on a separate line is fine.

[eureka-cpu]

This was fixed by #2338