`(1|2|3)[]` type in diagnostics is printed as `'1|2|3[]'` instead of `'(1|2|3)[]'`

**Description:**
```bal
public function main() {
    (1|2|3)[] ar = 3; // incompatible types: expected '1|2|3[]', found 'int'
}
```
As with type precedence, `'1|2|3|[]'` means `1|2|(3[])`.
Correct error msg should be `incompatible types: expected '(1|2|3)[]', found 'int'`

**Affected Versions:**
2201.0.0

