Small behavior fix

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

@@ -136,6 +136,7 @@ public class FragmentFolder extends FragmentBase {
             @Override
             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                 cbPoll.setEnabled(isChecked);
+                cbDownload.setEnabled(isChecked);
             }
         });