修改设置图片后背景图片数据丢失问题。

powerbell/src/main/java/cc/winboll/studio/powerbell/fragments/MainViewFragment.java

@@ -322,6 +322,7 @@ public class MainViewFragment extends Fragment {
 
     public void reloadBackground() {
 		BackgroundSourceUtils utils = BackgroundSourceUtils.getInstance(getActivity());
+		mBgSourceUtils.loadSettings();
 		BackgroundBean bean = utils.getCurrentBackgroundBean();
 		mBackgroundView.loadBackground(bean);
     }

powerbell/src/main/java/cc/winboll/studio/powerbell/utils/BackgroundSourceUtils.java

@@ -314,7 +314,7 @@ public class BackgroundSourceUtils {
     /**
      * 加载背景图片配置数据（核心：确保current/preview是两份独立的BackgroundBean实例）
      */
-    void loadSettings() {
+    public void loadSettings() {
         // 1. 加载正式Bean（独立实例：从currentBackgroundBean.json加载，不存在则新建）
         currentBackgroundBean = BackgroundBean.loadBeanFromFile(currentBackgroundBeanFile.getAbsolutePath(), BackgroundBean.class);
         if (currentBackgroundBean == null) {