Remove redundant invisible DialogWindow definition in TrayApp

- Eliminated unused code for maintaining a cleaner and more maintainable codebase.
- Updated the remaining `DialogWindow` logic for explicit dismissal requests.

Author: kdroidFilter

src/commonMain/kotlin/com/kdroid/composetray/tray/api/TrayApp.kt

@@ -609,20 +609,6 @@ private fun ApplicationScope.TrayAppImplLinux(
 
     DisposableEffect(Unit) { onDispose { tray.dispose() } }
 
-    // Helper window
-    DialogWindow(
-        onCloseRequest = { /* noop */ },
-        visible = false,
-        state = rememberDialogState(
-            size = DpSize(1.dp, 1.dp),
-            position = WindowPosition(0.dp, 0.dp)
-        ),
-        transparent = true,
-        undecorated = true,
-        resizable = false,
-        focusable = false,
-    ) { }
-
     DialogWindow(
         onCloseRequest = { requestHideExplicit() },
         title = "",