Fix formatting in gateway-models test

Remove a stray blank line flagged by `biome ci` in the quality check.

Generated-By: PostHog Code
Task-Id: ea8239ab-8fc1-46b7-8dc6-d3661caf8800

Author: Twixes

packages/agent/src/gateway-models.test.ts

@@ -116,7 +116,6 @@ describe("getClaudeModelRecency", () => {
       getClaudeModelRecency("claude-fable-5"),
     );
   });
-
 });
 
 describe("compareModelsForPicker", () => {