Removed export from template

[ntimo]

Hello,
I removed the export from the template because it breaks Ubuntu cron files. cron will deactivate the file because its invalid. Also a export is not needed to set a environment variable in a cron file :)

[paulfantom]

Heh, export was added since restic didn't work on some platform. It was added in #31. I think this will need testing on non-debian platforms first to settle it once and for all :)

[ntimo]

I will test it later today with a Arch Linux VM. And let you know if it works without the export.

[TheLastProject]

I need to remove the exports too for it to work on Ubuntu 16.04. I think cron may be executed with dash instead of bash there, and export X=y directly is a bashism. However, I didn't need the exports at all for the cron job to work. It's also noticeable in #31 that the original committer apparently reverted this export adding in one of their own branches. So, from my point of view, it doesn't seem necessary to have those exports at all but they break things.