Prevent loop

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

@@ -210,12 +210,14 @@ public class FragmentSetup extends FragmentEx {
                         prefs.edit().putString("theme", checked ? "dark" : "light").apply();
                     }
                 } else {
+                    if (checked) {
                         tbDarkTheme.setChecked(false);
                         FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
                         fragmentTransaction.replace(R.id.content_frame, new FragmentPro()).addToBackStack("pro");
                         fragmentTransaction.commit();
                     }
                 }
+            }
         });
 
         btnOptions.setOnClickListener(new View.OnClickListener() {