Comptime is not required for arguments of comptime only types after first generic argument

Example

```zig
fn Matrix(
    comptime T: type,
    width: comptime_int,
    height: comptime_int,
) type {
    return [height][width]T;
}
```

`width` and `heigth` should be checked and require `comptime` even if they are actually type erased.