DO NOT MERGE: fix wallpaper restore

Following a restore of the wallpaper data files, the settingsRestored()
method was binding the new wallpaper by passing null as the component,
because once upon a time that meant just use the configuration that had
just been loaded from the [newly restored] settings filed.  However, at
some point this broke when the load from settings was made a staging
operation, not also the commitment of the changes.

This CL passes the newly-determined component configuration explicitly
to the bind, overriding the product default that may already have been
emplaced by the time the restore happens.

Will not merge cleanly downstream; the parallel (small) change will
be made explicitly there.

Bug 5416839

Change-Id: I50b5d57fafd176529ac7a90cac8116bbc9f696fd

services/java/com/android/server/WallpaperManagerService.java

@@ -786,7 +786,7 @@ class WallpaperManagerService extends IWallpaperManager.Stub {
                 }
                 if (DEBUG) Slog.v(TAG, "settingsRestored: success=" + success);
                 if (success) {
-                    bindWallpaperComponentLocked(null, false);
+                    bindWallpaperComponentLocked(mNextWallpaperComponent, false);
                 }
             }
         }