Fix regression in ea2a929f, check for Wayland

Fix regression in ea2a929f, which broke x11 support by not checking for
Wayland when making the Wayland EGL subsurface move call.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>

src/wx/panel.cpp

@@ -2364,7 +2364,8 @@ void GLDrawingPanel::OnSize(wxSizeEvent& ev)
     AdjustViewport();
 
     // Temporary hack to backport 800d6ed69b from wxWidgets until 3.2.2 is released.
-    MoveWaylandSubsurface(this);
+    if (IsWayland())
+        MoveWaylandSubsurface(this);
 
     ev.Skip();
 }

src/wx/wayland.cpp

@@ -17,6 +17,8 @@ bool IsWayland() { return GDK_IS_WAYLAND_DISPLAY(gdk_display_get_default()); }
 
 void MoveWaylandSubsurface(wxGLCanvas* win)
 {
+    if (!IsWayland()) return;
+
     int x, y;
     gdk_window_get_origin(win->GTKGetDrawingWindow(), &x, &y);
     wl_subsurface_set_position(win->m_wlSubsurface, x, y);