Draft: activity: Use parent's app id if available

Guido Günther requested to merge guidog/phosh:app-id-from-parent into main

This is usually more reliable of e.g. a dialog's app-id. This has several TODOs in the code (hence draft), I mostly wanted to do a quick check if this is works as intended.

/cc @eliasrudberg as this came out of #958 (closed)

Closes: #959 Signed-off-by: Guido Günther agx@sigxcpu.org

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