Disable certificate transparency

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

@@ -1107,6 +1107,9 @@ public class ApplicationEx extends Application
                 editor.putBoolean("restore_on_launch", false);
         }
 
+        if (version < 2283)
+            editor.remove("cert_transparency");
+
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && !BuildConfig.DEBUG)
             editor.remove("background_service");