feat：优化启动广告展示

@@ -89,9 +89,9 @@ struct LaunchAdvertisingPage {
             }else {
               //显示图片
               Image(this.defaultModel.bootScreenUrl)
-                .objectFit(this.isPad?ImageFit.Contain:ImageFit.Cover)
+                .objectFit(this.isPad?ImageFit.Auto:ImageFit.Cover)
                   // .expandSafeArea([SafeAreaType.SYSTEM], [SafeAreaEdge.TOP, SafeAreaEdge.BOTTOM])
-                .width('100%')
+                // .width('100%')
                 .height('100%')
             }
           }