refactor(launcher): remove redundant window flags configuration

Remove commented visibility setting and conditional window flags
that are no longer needed.

删除不再需要的窗口可见性注释和条件窗口标志配置。

Log: 移除冗余的窗口标志配置
PMS: BUG-289261, BUG-343503
Influence: 清理冗余代码，窗口标志现在由 DLayerShellWindow 统一管理。

Author: add-uos

shell-launcher-applet/package/launcheritem.qml

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2023 -2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -205,12 +205,6 @@ AppletItem {
         DLayerShellWindow.exclusionZone: -1
         DLayerShellWindow.scope: "dde-shell/launchpad"
 
-        // visibility: Window.FullScreen
-        flags: {
-            if (DebugHelper.useRegularWindow) return Qt.Window
-            return (Qt.FramelessWindowHint | Qt.Tool)
-        }
-
         DWindow.enabled: !DebugHelper.useRegularWindow
         DWindow.windowRadius: 0
         DWindow.enableSystemResize: false