Fix Terminal-Bench task_id to terminalbench_2

.eval_results/terminal_bench.yaml

@@ -1,6 +1,6 @@
 - dataset:
     id: harborframework/terminal-bench-2.0
-    task_id: terminal_bench
+    task_id: terminalbench_2
   value: 33.4
   date: '2026-01-28'
   source:
@@ -8,4 +8,3 @@
     name: Terminal-Bench Leaderboard
     user: burtenshaw
   notes: "agent: Terminus 2"
-