updated ACP checkbox module so that it hides the checkbox via js instead of blanket CSS hiding

public/less/admin/modules/checkboxes.less

@@ -1,7 +1,3 @@
-[type=checkbox] {
-	display: none;
-}
-
 label {
 	cursor: pointer;
 }

public/src/admin/admin.js

@@ -179,6 +179,7 @@
 			var checkbox = $(this),
 				checked = checkbox.is(':checked');
 
+			checkbox.hide();
 			if (checked) {
 				checkbox.after('<i class="fa fa-toggle-on"></i>');
 			}