fix install_beamsearch_decoders
# What does this PR do ?

fix install_beamsearch_decoders.sh

**Collection**: ASR

# Changelog 
- fix install_beamsearch_decoders.sh

# Usage
* install_beamsearch_decoders.sh work with and without root user 
* provide NEMO_PATH in the tutorial Offline_ASR.ipynb  

**PR Type**:
- [V ] Bugfix

# Additional Information
* Related to # 4186721
