bugzilla: delete bugs.wikipedia.org vhost

it's already gone from DNS:
Host bugs.wikipedia.org not found: 3(NXDOMAIN)

this virtual host can be deleted to simplify
config at least a little bit

Change-Id: I850b96210a42cdc09ec431f02547c29973f2baf5
Merge "bugzilla: delete bugs.wikipedia.org vhost" into production