Windows: fix initial active status (#9694)

Separate from #9451

On Windows, a new window may already active immediate after creation.

Release Notes:

- N/A

---------

Co-authored-by: Mikayla <mikayla@zed.dev>

crates/gpui/src/platform/windows/window.rs

@@ -1389,6 +1389,10 @@ impl PlatformWindow for WindowsWindow {
         unsafe { SetForegroundWindow(self.inner.hwnd) };
     }
 
+    fn is_active(&self) -> bool {
+        self.inner.hwnd == unsafe { GetActiveWindow() }
+    }
+
     // todo(windows)
     fn set_title(&mut self, title: &str) {
         unsafe { SetWindowTextW(self.inner.hwnd, &HSTRING::from(title)) }