Windows: Remove locked screen detection

This does not reliably tell us when the screen is locked.
For example this triggers when a UAC prompt is active.
From the Windows documentation there is no way to determine
if a workstation is locked

Fixes #9117

gajim/common/idle.py

@@ -168,13 +168,6 @@ class WindowsIdleMonitor:
         info = self.SystemParametersInfo(0x72, 0, ctypes.byref(saver_runing), 0)
         if info and saver_runing.value:
             return True
-
-        # Check if Screen is locked
-        desk = self.OpenInputDesktop(0, False, 0)
-        if not desk:
-            return True
-        self.CloseDesktop(desk)
-
         return False