fix:bug[17189] 修改密码页鸿蒙版的密码可见，返回图标UI样式与安卓不一致

@@ -165,6 +165,7 @@ struct ModifyPasswordPage {
       }.padding({top:"92lpx",left:"48lpx",right:"48lpx"})
 
     }.titleMode(NavigationTitleMode.Mini)
+    .backButtonIcon($r("app.media.login_back_icon"))
     .title('')
   }
 
@@ -200,4 +201,6 @@ struct ModifyPasswordPage {
     this.toastText = msg
     this.dialogToast.open()
   }
-}
\ No newline at end of file
+}
+
+