fix: window border on Gnome Wayland (#46642)

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

shell/browser/ui/electron_desktop_window_tree_host_linux.cc

@@ -195,7 +195,7 @@ void ElectronDesktopWindowTreeHostLinux::UpdateFrameHints() {
     if (ui::OzonePlatform::GetInstance()->IsWindowCompositingSupported()) {
       // Set the opaque region.
       std::vector<gfx::Rect> opaque_region;
-      if (!IsShowingFrame()) {
+      if (IsShowingFrame()) {
         // The opaque region is a list of rectangles that contain only fully
         // opaque pixels of the window.  We need to convert the clipping
         // rounded-rect into this format.