`RULE-5-13-4`:  False unsuffixed literal reported for T{} class member initializer

### Affected rules
 - `RULE-5-13-1`

### Description

Discovered on a QLX pull request. Likely related to the nested aggregate classes.

### Example

```cpp
class C1 {
  size_t x = static_cast<size_t>(0);
};

class C2 {
  C1 y{}; // falsely reported here
};
```
