Remove highway=bicycle safety bonys

[TheMarex]

Issue

This removes a bonus for a road class that doesn't exist (cycleway would be correct), but the code was buggy since safety_bonus is nil and caused an arithmetic exception. We only caught this 4 (!) years later since recently a way was tagged with highway=bicycle and made it in our OSM data leading to preprocessing failures.

Tasklist

• [x] CHANGELOG.md entry