[engine] Fix the issue where UV values are not updated during texture switching

engine/cocos2d/core/components/CCSprite.js

@@ -495,6 +495,7 @@ var Sprite = cc.Class({
                 const textureImpl = texture && texture.getImpl();
                 if (material.getProperty('texture') !== textureImpl) {
                     material.setProperty('texture', texture);
+                    this.setVertsDirty();
                 }
             }