Update LJSpeech whitelist file path
Signed-off-by: Jocelyn Huang <jocelynh@nvidia.com>

# What does this PR do ?

Updates various files with the new path for the LJSpeech whitelist file

**Collection**: TTS
  
**PR Type**:
- [ ] New Feature
- [x] Bugfix
- [ ] Documentation

# Additional Information
* Related to #4076
