Add wallpaper suggestion if one isn't set.

Change-Id: I81380323f0d4f5af842a81028a763219958833bc

src/com/android/settings/Settings.java

@@ -125,6 +125,8 @@ public class Settings extends SettingsActivity {
     public static class AppWriteSettingsActivity extends SettingsActivity { /* empty */ }
     public static class ManageDefaultAppsActivity extends SettingsActivity { /* empty */ }
 
+    public static class WallpaperSuggestionActivity extends SettingsActivity { /* empty */ }
+
     // Categories.
     public static class WirelessSettings extends SettingsActivity { /* empty */ }
     public static class DeviceSettings extends SettingsActivity { /* empty */ }