Default rate was a bit slow even for being slow. Fixed to a more sane starting point.

internal/config/startup_test.go

@@ -27,7 +27,7 @@ func TestStartupSaveDestinationAndLegacySettingsIgnored(t *testing.T) {
 			if err := os.WriteFile(legacyPath, legacy, 0600); err != nil {
 				t.Fatal(err)
 			}
-			requested, destination, rate := "", userPath, -20
+			requested, destination, rate := "", userPath, 0
 			if scenario != "defaults" {
 				system := Defaults()
 				system.Presentation.Speech.Rate = 30