X11: Fix black flashes on boot and while resizing (#13002)

Release Notes:

- N/A

crates/gpui/src/platform/linux/x11/window.rs

@@ -256,7 +256,6 @@ impl X11WindowState {
         };
 
         let win_aux = xproto::CreateWindowAux::new()
-            .background_pixel(x11rb::NONE)
             // https://stackoverflow.com/questions/43218127/x11-xlib-xcb-creating-a-window-requires-border-pixel-if-specifying-colormap-wh
             .border_pixel(visual_set.black_pixel)
             .colormap(colormap)
@@ -335,7 +334,6 @@ impl X11WindowState {
             )
             .unwrap();
 
-        xcb_connection.map_window(x_window).unwrap();
         xcb_connection.flush().unwrap();
 
         let raw = RawWindow {
@@ -366,6 +364,7 @@ impl X11WindowState {
             size: query_render_extent(xcb_connection, x_window),
             transparent: params.window_background != WindowBackgroundAppearance::Opaque,
         };
+        xcb_connection.map_window(x_window).unwrap();
 
         Ok(Self {
             client,