printf: Integers: If value and precision are zero, nothing should be printed

Looking at C/C++ reference https://en.cppreference.com/w/c/io/fprintf:
> If both the converted value and the precision are ​0​ the conversion results in no characters.

```
$ env printf "%.0d\n" 0
<blank line>
$ ./coreutils-main printf "%.0d\n" 0
0
```