Stop sending prompt to Whisper transcription

internal/transcription/client_test.go

@@ -28,7 +28,7 @@ func TestWhisperUsesAudioTranscriptionsEndpoint(t *testing.T) {
 	}))
 	defer audioSrv.Close()
 
-	var gotPath, gotModel, gotResponseFormat string
+	var gotPath, gotModel, gotResponseFormat, gotPrompt string
 	providerSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		gotPath = r.URL.Path
 		if err := r.ParseMultipartForm(16 << 20); err != nil {
@@ -36,6 +36,7 @@ func TestWhisperUsesAudioTranscriptionsEndpoint(t *testing.T) {
 		}
 		gotModel = r.FormValue("model")
 		gotResponseFormat = r.FormValue("response_format")
+		gotPrompt = r.FormValue("prompt")
 		if _, _, err := r.FormFile("file"); err != nil {
 			t.Fatalf("FormFile: %v", err)
 		}
@@ -69,6 +70,9 @@ func TestWhisperUsesAudioTranscriptionsEndpoint(t *testing.T) {
 	if gotResponseFormat != "json" {
 		t.Fatalf("response_format = %q, want json", gotResponseFormat)
 	}
+	if gotPrompt != "" {
+		t.Fatalf("prompt = %q, want empty", gotPrompt)
+	}
 	if len(got.Segments) != 2 || got.Segments[0].Text != "Алло, тест." || got.Segments[1].Start != 1.2 {
 		t.Fatalf("segments = %#v", got.Segments)
 	}