bin/asss exit code and run-asss

[Former user]

[[https://bitbucket.org/grelminar/asss/changeset/68fe70c8c291|68fe70c8c291]] introduced a bug in run-asss. EXIT was being set to the exit code from tee rather than bin/asss. This is fixed for bash only(?) in [[https://bitbucket.org/grelminar/asss/changeset/2011ed328739|2011ed328739]]. It would be nice to find a solution that is portable to more/all shells.