[Merge] lp:~attente/maliit/1245925 into lp:~ubuntu-core-dev/maliit/maliit-framework-ubuntu

[Ricardo Salveti]

Review: Approve

There is a side effect of changing it this way as it will export the variable if you're trying to launch apps from the shell (adb/ssh), as XDG_SESSION_DESKTOP is not available in there. This is not a problem as we have the same export happening via /etc/environment, so it's still a good change.

Later I don't think we need to have this file provided by this package, but we fist need to clean up our environment file.
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https://code.launchpad.net/~attente/maliit/1245925/+merge/250311
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