Fix bug where we show expiration date unnecessarily in the Autofill

card unmasking prompt.

BUG=487866

Review URL: https://codereview.chromium.org/1134793009

Cr-Commit-Position: refs/heads/master@{#330245}

chrome/browser/ui/autofill/card_unmask_prompt_controller_impl.cc

@@ -48,6 +48,7 @@ void CardUnmaskPromptControllerImpl::ShowPrompt(
   if (card_unmask_view_)
     card_unmask_view_->ControllerGone();
 
+  new_card_link_clicked_ = false;
   shown_timestamp_ = base::Time::Now();
   pending_response_ = CardUnmaskDelegate::UnmaskResponse();
   LoadRiskFingerprint();