pipewire.conf.in: use absolute path to pipewire-media-session

So pipewire daemon is able to find pipewire-media-session from the
location it's installed to, even when it's not in $PATH.

For the `pw-ininstalled.sh` and `make run` invocations, provide a
`src/daemon/pipewire-uninstalled.conf` that still uses the relative
path, but isn't installed.
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