test(middleware): silence errcheck on AfterEach os.RemoveAll

The new tool_choice parsing tests added a second AfterEach that calls
os.RemoveAll(modelDir) without checking the error; errcheck flagged it.
Suppress with the standard _ = idiom. The pre-existing AfterEach on the
earlier Describe still elides the check the same way it did before -
leaving that untouched to keep this commit minimal.

Assisted-by: Claude:opus-4-7 [Claude Code]
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

Author: mudler

core/http/middleware/request_test.go

@@ -371,7 +371,7 @@ var _ = Describe("SetModelAndConfig tool_choice parsing (chat completions)", fun
 	})
 
 	AfterEach(func() {
-		os.RemoveAll(modelDir)
+		_ = os.RemoveAll(modelDir)
 	})
 
 	// chatReq wraps a tool_choice JSON fragment in a minimal valid chat-completions