Return mUnsupportedVideoMimeTypes from the getter

Currently we are returning mSupportedVideoMimeTypes from
getUnsupportedVideoMimeTypes.

BUG=176993974, 158466651
Test: manual

Change-Id: Ifc2d136d18488e827eee43fed7f32bb8868c51d5
diff --git a/apex/media/framework/java/android/media/ApplicationMediaCapabilities.java b/apex/media/framework/java/android/media/ApplicationMediaCapabilities.java
index 13c4953..24c9e78 100644
--- a/apex/media/framework/java/android/media/ApplicationMediaCapabilities.java
+++ b/apex/media/framework/java/android/media/ApplicationMediaCapabilities.java
@@ -237,7 +237,7 @@
      */
     @NonNull
     public List<String> getUnsupportedVideoMimeTypes() {
-        return new ArrayList<>(mSupportedVideoMimeTypes);
+        return new ArrayList<>(mUnsupportedVideoMimeTypes);
     }
 
     /*