Append flatpak data dirs if XDG_DATA_DIRS is already set (#611)

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* Append flatpak data dirs if XDG_DATA_DIRS is already set

Otherwise it will be impossible to run flatpak apps from desktop menus.
This issue can happen if another app (e.g. snapd) wants to add custom
folders to XDG_DATA_DIRS through /etc/profile.d

If XDG_DATA_DIRS is empty or unset, define it as before.

Fixes #606

(cherry picked from commit a9acdc0532)

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