Be careful before setting account's delete policy

* We were using the getSelectedItem() from the deletion spinner to
  set the account's deletion policy, even if that spinner was
  invisible (which it would be for IMAP).
* The result of this is indeterminate; sigh
* The fix is to make sure the spinner is visible before using its
  value

Bug: 5216422
Change-Id: I7e44b5e8127f5277693f7e962899e8642be55239
1 file changed