dispatcher: fix an error in initialisation

[jchavanton]

training of the latency estimator

Pre-Submission Checklist

• Commit message has the format required by CONTRIBUTING guide
• Commits are split per component (core, individual modules, libs, utils, ...)
• Each component has a single commit (if not, squash them into one commit)
• No commits to README files for modules (changes must be done to docbook files
  in doc/ subfolder, the README file is autogenerated)

Type Of Change

• Small bug fix (non-breaking change which fixes an issue)

Checklist:

• Tested changes locally

Description

minor issue with the estimator initialization / training

[miconda]

Thanks, you can merge it and backport if needed.