Export proper environment variable for $SSH_ASKPASS

[PCMan]

Export proper environment variable for $SSH_ASKPASS, so openssh can call it properly.

[jleclanche]

Should this be done in lxqt-session along with the other variables?

[PCMan]

Should we do this by default? Since lxqt-ssh-askpass is optional, it might not exist sometimes.
Maybe it's better to get this documented, and ask the people who use it to set the environment variable themselves?
Alternatively, we can add a combobox in lxqt-config-session for it. So people can do this through GUI.

[luis-pereira]

@PCMan A user can set the SSH_ASKPASS in the lxqt-config-session > Environment (Advanced) section. Isn't that enough ?

[antis81]

@PCMan I would love to see lxqt-openssh-askpass as a default in the session configuration. At least the environment variable should be included.