Don't fetch the root window early

Wine is weird. The whole reason why we're doing these weird things is
because Wine somehow tries to delete the window twice. If we don't call
`xcb_query_tree()` here (and get an error back), then we're back at the
error we tried to solve. Apparently this works, and given that noone
dares touching Wine's X11drv code I won't ask any further questions.

src/wine-host/editor.h

@@ -102,7 +102,7 @@ class DeferredWin32Window {
      */
     DeferredWin32Window(MainContext& main_context,
                         std::shared_ptr<xcb_connection_t> x11_connection,
-                        HWND window);
+                        HWND window) noexcept;
 
     /**
      * Post a `WM_CLOSE` message to the `handle`'s message queue as described
@@ -115,9 +115,6 @@ class DeferredWin32Window {
    private:
     MainContext& main_context;
     std::shared_ptr<xcb_connection_t> x11_connection;
-
-    const xcb_window_t wine_window;
-    const xcb_window_t root_window;
 };
 
 /**