fix(uiSelectCtrl): scroll to active position on dropdown open in conjunction with $animate

The function `_ensureHighlightVisible()` that scrolls to the
active (highlighted) element is never invoked at the end of the
animation, when animation is used

The logic that handles non animation opening is a bit different in that
it scrolls to the highlighted element

Updated the animation handler to perform similarly

Author: kidroca

src/uiSelectController.js

@@ -167,16 +167,12 @@ uis.controller('uiSelectCtrl',
         if (phase === 'start' && ctrl.items.length === 0) {
           // Only focus input after the animation has finished
           ctrl.$animate.off('removeClass', searchInput[0], animateHandler);
-          $timeout(function () {
-            ctrl.focusSearchInput(initSearchValue);
-          });
+          _focusWhenReady(initSearchValue);
         }
         else if (phase === 'close') {
           // Only focus input after the animation has finished
           ctrl.$animate.off('enter', container[0], animateHandler);
-          $timeout(function () {
-            ctrl.focusSearchInput(initSearchValue);
-          });
+          _focusWhenReady(initSearchValue);
         }
       };