Add a confirm on delete

From Steven Joseph on 2015/07/26 21:47:04 +0000

The delete button is to close to the swipe to end tracking, I keep hitting delete amid the undo duration is too low

Copied from original feature request: http://urbandroid.uservoice.com/forums/264867-sleep-as-android/suggestions/9032743-add-a-confirm-on-delete