The previous fix added DISPLAY to the import but left it as a separate
exec line. sway runs exec lines asynchronously and does not order them, so
Sunshine won the race every time — it started in the same second as the
compositor, before DISPLAY existed in the manager environment, and passed
no DISPLAY to the apps it launched. Steam still failed with "Unable to
open a connection to X" while Xwayland was up and the manager environment
looked correct, which is what made it confusing.
One exec with && instead of two.
The earlier verification was wrong for the same reason: I launched Steam
by hand with DISPLAY=:0 set, which tested Xwayland rather than the path
Sunshine actually uses. Re-verified properly by launching Steam in a shell
carrying only the environment read out of Sunshine's own /proc entry.
connor
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