Bug 1077470 - [Contacts] Add image from gallery to contacts needs a close (x) button instead of a back arrow

Also, as commented above https://github.com/mozilla-b2g/gaia/pull/24883#discussion-diff-19363190R744 it will be good to store  $('pick-header-heading') in a variable to avoid repeat call to document.getElementById, something like

var  pickHeading=  $('pick-header-heading');
pickHeading.textContent = pickHeading.textContent;