Wrong handling of collect prompt number of digits

[ThE-MaRaC]

Is this a BUG REPORT or FEATURE REQUEST?:

Uncomment only one, leave it on its own line:

/kind bug

/kind feature

What happened:
When there are more then one collect prompt in the application and number of digits setting is set in only one of them, the same setting is applied to all collect prompts.
What you expected to happen:
Number of digits setting should be applied only to the collect prompt where it is set. All other prompts should use default/empty value. Behaviour should be the same as for Finish on key settings.
How to reproduce it (as minimally and precisely as possible):
Create an application with 2 collect prompts and set number of digits only to the 1st one. The same setting will be applied to the 2nd collect prompt.

Anything else we need to know?:

Environment:

• Restcomm Connect version (from startup logs): compiled from master branch (2194dee)
• Cloud provider or hardware configuration: hardware
• OS (e.g. from /etc/os-release): Ubuntu 18.04.4 LTS
• Kernel (e.g. uname -a): 4.4.0 x86_64 GNU/Linux
• Deployment method (e.g. docker-compose, with linked docker-compose.yml file,
  or application server info + deployment option): JBoss AS 7.2.0.Final
• Others:

If you need any other info, please let me know