feeds.conf: update revision of packages-berlin

This update contains important changes for the following tickets:

* freifunk-berlin/firmware#45 move olsr config
* freifunk-berlin/firmware#30 Remove defaults from wizard

And some minor cosmetic changes.
Merge pull request #47 from freifunk-berlin/update/package-berlin

feeds.conf: update revision of packages-berlin
Merge branch 'master' into bug/freifunk-policyrouting-hotplug