Fix Fuzzer for 2.11

This fixes two issues with the Fuzzer when running '+publishLocal':

- Avoid foo(_) pattern due to weaker 2.11 type inference
- Use seqAsJavaListConverter instead of seqAsJavaList (a 2.12
  addition)

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>