Fix: Correctly distinguish involved structures

Fixed a bug causing Control Tower belonging to Corp A as final blow pilot
on a kill where Control Tower belonging to Corp B actually laid the final
blow. This error could be observed in kill list tables and top lists.
Fix: zKB fetch fetching the same kills all over again

Fixed a bug causing zKB fetch to fetch the same bunch of kills until it
hit the maximum cycle count.
Occurred if all kills returned had the same timestamp.
Fixed formatting of zKB fetch error texts