Revert "close-button for share_dropdown"

This reverts commit 3bc3d4c9f3.

core/js/share.js

@@ -211,7 +211,6 @@ OC.Share={
 				}
 			});
 
-			html += '<p align="right"><button class="icon-close share-dropdown-close" /></p>';
 			html += '<input id="shareWith" type="text" placeholder="'+t('core', 'Share with user or group …')+'" />';
 			html += '<ul id="shareWithList">';
 			html += '</ul>';
@@ -553,10 +552,6 @@ $(document).ready(function() {
 		}
 	});
 
-	$(document).on('click', '.share-dropdown-close', function(event) {
-		OC.Share.hideDropDown();
-	});
-
 	$(this).click(function(event) {
 		var target = $(event.target);
 		var isMatched = !target.is('.drop, .ui-datepicker-next, .ui-datepicker-prev, .ui-icon')