run: Try using /var/run/pulse/native as PulseAudio socket

This brings us closer to matching what happens in libpulse.so.0.
This path is the default for a system-wide PulseAudio instance, which
is discouraged on non-embedded systems but is easy to check for.
In particular, SteamOS, an "appliance"-style gaming OS, uses this
socket.

Adapted from Steam's pressure-vessel container tool, which reuses
various Flatpak modules, including this function.

Signed-off-by: Simon McVittie <smcv@collabora.com>
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