Adjusted starting speech rate for new users. Fixed error that could happen when figuring out where to write changes.

internal/app/attributes_test.go

@@ -271,7 +271,7 @@ func TestAttributeSessionToggleQuickSaveAndFreshStartup(t *testing.T) {
 					t.Fatal(err)
 				}
 				saved, _, err := config.Load(path, nil)
-				if err != nil || saved.Reading.Attributes != mode || saved.Reading.AttributeFormat != "fenrirBold" || saved.Presentation.Speech.Rate != 90 {
+				if err != nil || saved.Reading.Attributes != mode || saved.Reading.AttributeFormat != "fenrirBold" || saved.Presentation.Speech.Rate != -10 {
 					t.Fatal("temporary toggle persisted", saved, err)
 				}
 				settings = saved