tof: membership: adjust highly-productive to 115

Leaving at 100 would have too many "highly-productive" contributors
for 2026H1 (over 20%).  Raise the benchmark to 115 to keep the qualified
group within expectations.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I439e4987d56488b11af7f1df82a71081865d1048