Kicad manager: fix a minor cosmetic issue when clicking on a launcher button.

- On GTK the next button was gaining the focus.
- On MSW the button disappears a bit of time.
Fixes #9676
https://gitlab.com/kicad/code/kicad/issues/9676

kicad/dialogs/panel_kicad_launcher.cpp

@@ -67,9 +67,12 @@ void PANEL_KICAD_LAUNCHER::CreateLaunchers()
             auto handler =
                     [&]( wxEvent& aEvent )
                     {
-                        // Defocus the button because leaving the large buttons 
+                        // Defocus the button because leaving the large buttons
                         // focused after a click looks out of place in the launcher
                         GetParent()->SetFocus();
+                        // Gives a slice of time to update the button state (mandatory on GTK,
+                        // useful on MSW to avoid some cosmetic issues).
+                        wxSafeYield();
 
                         OPT_TOOL_EVENT evt = aAction.MakeEvent();
                         evt->SetHasPosition( false );