Keep track of the installation status of AB updates

This allows to show the correct labels.

Change-Id: I52f42e042af0df2d091d786c03102cec352b3a5b

src/org/lineageos/updater/model/UpdateInfo.java

@@ -35,4 +35,6 @@ public interface UpdateInfo extends UpdateBaseInfo {
     int getInstallProgress();
 
     boolean getAvailableOnline();
+
+    boolean getFinalizing();
 }