training of the latency estimator

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#### Description <!-- Describe your changes in detail --> minor issue with the estimator initialization / training

You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/2485

-- Commit Summary --

* dispatcher: fix an error in initially

-- File Changes --

M src/modules/dispatcher/dispatch.c (8)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2485.patch https://github.com/kamailio/kamailio/pull/2485.diff