update skipHide to multiple

Author: sirineJB

js/angular-material-datetimepicker.js

@@ -181,7 +181,7 @@
                 bindToController: true,
                 disableParentScroll: false,
                 hasBackDrop: false,
-                skipHide: true
+                multiple: true
               })
                 .then(function (v) {
                   scope.currentDate = v ? v._d : v;