Draft: pipewiresrc: Do timestamps by default if live

Closed Robert Mader requested to merge rmader/pipewire:gst-timestamps into master

Setting timestamps is usually desired for live-sources, be it cameras or screencasts, in order to allow correct recordings. Thus set it by default if the source the source is life, which it almost always is.

This crucially enables timestamps for sources created by the device provider, fixing broken video recordings in Cheese and similar apps.

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