Close some Cursors and call super.onFinishInflate().

Android Studio gave these warnings, and they seem like good ideas.

Change-Id: I9a4d3997fd18e86e007e4511e1ac9e8a75509265

src/com/android/launcher3/PageIndicatorMarker.java

@@ -45,6 +45,7 @@ public class PageIndicatorMarker extends FrameLayout {
     }
 
     protected void onFinishInflate() {
+        super.onFinishInflate();
         mActiveMarker = (ImageView) findViewById(R.id.active);
         mInactiveMarker = (ImageView) findViewById(R.id.inactive);
     }