Fix a typo in VideoView.java that disabled the seek-back button by default.

Change-Id: I23a9423b20646529b652e23349266a3291981484
related-to-bug: 2498317
diff --git a/core/java/android/widget/VideoView.java b/core/java/android/widget/VideoView.java
index fb8b5aa..ded0559 100644
--- a/core/java/android/widget/VideoView.java
+++ b/core/java/android/widget/VideoView.java
@@ -291,7 +291,7 @@
                 mCanSeekForward = !data.has(Metadata.SEEK_FORWARD_AVAILABLE)
                         || data.getBoolean(Metadata.SEEK_FORWARD_AVAILABLE);
             } else {
-                mCanPause = mCanSeekForward = mCanSeekForward = true;
+                mCanPause = mCanSeekBack = mCanSeekForward = true;
             }
 
             if (mOnPreparedListener != null) {