Fix issue where errors from SoLoud would not propagate

[filiph]

Description

The C++ play and play3d methods return a 0 when there's an error. I neglected to convert that to SoundHandle.error().

Type of Change

• [ ] ✨ New feature (non-breaking change which adds functionality)
• [x] 🛠️ Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🧹 Code refactor
• [ ] ✅ Build configuration change
• [ ] 📝 Documentation
• [ ] 🗑️ Chore