fix(carousel): fix animation from programmatic trigger

- Fix animations of slides when programmatically changing active slide
  index

Closes #5674
Fixes #5601

Author: wesleycho

src/carousel/carousel.js

@@ -161,9 +161,9 @@ angular.module('ui.bootstrap.carousel', [])
 
       var slide = slides[index];
       if (slide) {
-        currentIndex = index;
         setActive(index);
         self.select(slides[index]);
+        currentIndex = index;
       }
     }
   });