Update PolystarContent.java (#881)

fix copy paste mistake
diff --git a/lottie/src/main/java/com/airbnb/lottie/animation/content/PolystarContent.java b/lottie/src/main/java/com/airbnb/lottie/animation/content/PolystarContent.java
index 2e57789..c439d39 100644
--- a/lottie/src/main/java/com/airbnb/lottie/animation/content/PolystarContent.java
+++ b/lottie/src/main/java/com/airbnb/lottie/animation/content/PolystarContent.java
@@ -78,8 +78,8 @@
     outerRadiusAnimation.addUpdateListener(this);
     outerRoundednessAnimation.addUpdateListener(this);
     if (type == PolystarShape.Type.Star) {
-      outerRadiusAnimation.addUpdateListener(this);
-      outerRoundednessAnimation.addUpdateListener(this);
+      innerRadiusAnimation.addUpdateListener(this);
+      innerRoundednessAnimation.addUpdateListener(this);
     }
   }