Fixed dark pro

app/src/main/java/eu/faircode/email/FragmentSetup.java

@@ -210,6 +210,7 @@ public class FragmentSetup extends FragmentEx {
                         prefs.edit().putString("theme", checked ? "dark" : "light").apply();
                     }
                 } else {
+                    tbDarkTheme.setChecked(false);
                     FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
                     fragmentTransaction.replace(R.id.content_frame, new FragmentPro()).addToBackStack("pro");
                     fragmentTransaction.commit();