fix: Same cache image suffix with format

缓存图片后缀和格式保持相同

Log: 修复缓存图片后缀和格式不同问题
Bug: https://pms.uniontech.com/bug-view-247311.html
Influence: SetWallpaper

src/album/controller/wallpapersetter.cpp

@@ -45,7 +45,7 @@ bool WallpaperSetter::setBackground(const QString &pictureFilePath)
     QString errMsg;
     QFileInfo info(pictureFilePath);
     QString tempWallPaperpath;
-    tempWallPaperpath = WALLPAPER_PATH + info.baseName() + ".png";
+    tempWallPaperpath = WALLPAPER_PATH + info.baseName() + ".jpg";
     QFileInfo tempInfo(tempWallPaperpath);
     if (!UnionImage_NameSpace::loadStaticImageFromFile(pictureFilePath, tImg, errMsg)) {
         return false;