Update metrics category for new app page

Reused the old logging enum MANAGE_APPLICATIONS since we have ever made
Apps as a homepage entry in Android 6.

Bug: 174964405
Test: rebuild
Change-Id: I8531e3fb283c8d144af5d4e391636ca0980a4e73

src/com/android/settings/applications/AppDashboardFragment.java

@@ -48,7 +48,7 @@ public class AppDashboardFragment extends DashboardFragment {
 
     @Override
     public int getMetricsCategory() {
-        return SettingsEnums.SETTINGS_APP_NOTIF_CATEGORY;
+        return SettingsEnums.MANAGE_APPLICATIONS;
     }
 
     @Override