resources: Statuseffectlist first unknown field fix (#5843)

See #5842

While field 20 is technically the first field that could contain a
player ID, truncating right there results in an incomplete triplet.
Better to just delete the entirety of the first triplet instead of
having a malformed line.

resources/netlog_defs.ts

@@ -815,7 +815,7 @@ const latestLogDefinitions = {
  playerIds: {
  2: 3,
  },
- firstUnknownField: 20,
+ firstUnknownField: 18,
  canAnonymize: true,
  firstOptionalField: 18,
  },