Atom Query feature export: System lost MOST "Ring bond count" values - export to Molfile

**Environment details (please complete the following information):**
- Indigo Toolkit Version 1.18.0-dev.2.0-g369c82f8c-x86_64-linux-gnu-11.4.0
- Ketcher Version 2.17.0-rc.2 Build at 2024-01-03; 17:17:22
- Chrome Version 120.0.6099.130 (Official Build) (64-bit)
- Win10
- Issue found while testing https://github.com/epam/Indigo/issues/1440

**Describe the bug**
System lost MOST "Ring bond count" values

**Steps to Reproduce**
1. Open from file: [Ring bond count2.zip](https://github.com/epam/Indigo/files/13874480/Ring.bond.count2.zip)
2. Save it to Molfile file format
3. Clear canvas
4. Load from Molfile file format

**Actual behavior**
System losts most "Ring bond count" features

**Expected behavior**
System doesn't lost "Ring bond count" features

**Note**
problem is in v2000.js only first occurrence are set

```
if (!props.get('ringBondCount')) {
props.set('ringBondCount', sGroup.readKeyValuePairs(propertyData));
}
```