launch/user: Put env in both target desktop and service app_server.

It seems launch_daemon does not actually support root "env"s,
and adding support for that does not appear to be trivial.

Launch app_server in user context.

This way, we get the user's environment variables, and so should
input_server, which is started by app_server.

This should, after 6 years, fix #12534. We may need

Launch app_server in user context.

This way, we get the user's environment variables, and so should
input_server, which is started by app_server.

This should, after 6 years, fix #12534. We may need to revisit this
when/if we add multiuser support, but that is a problem for another day.

Change-Id: I04698306bc68a585acd232e9f9d29c50bc170a1f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4506
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

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launch/system: Use single-line "on" trigger.

The "user" launch file already uses this everywhere, so
we may as well save a few characters.