encodedstream: set "Rendering" state in "Stop" only when produceThread exists

Jack Xurequested to merge
jackyzy823/kpipewire:encodedstream-state into master

Only when produceThread exists and "deactivate" is called, state could be switched from "Rendering" to "Idle".

If produceThread doesn't exist, set state to "Idle" directly.

Background:

When testing krdp, the rdp client show black screen after connected.

It was working under krdp 6.3.4 + kpipewire 6.3.4.

It failed under krdp 6.4.5 + kpipewire 6.4.5.

A git bisection links the problem to 0ac4aa41

Edited by Jack Xu

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