ffwizard-berlin: enable freifunk-policyrouting by default/always

Addresses https://github.com/freifunk-berlin/firmware/issues/76

Makes the following commit obsolete:

https://github.com/freifunk-berlin/firmware/commit/dd5d2cf03c3fcb190954c48888f3351b0dc7552f

@geirkairam could you please review and merge this? Thanks!