[gnome-games] display-box: Enable event pass-through on flash box

[Alexander Mikhaylenko <alexm src gnome org>]

commit 808c328c917625dd0f1f12b86fdb91b18acac6a1
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Sep 20 21:58:08 2019 +0500

    display-box: Enable event pass-through on flash box
    
    Don't block pointer events when the flashbox is visible.

 data/ui/display-box.ui | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/data/ui/display-box.ui b/data/ui/display-box.ui
index b288071d..0b65224c 100644
--- a/data/ui/display-box.ui
+++ b/data/ui/display-box.ui
@@ -39,6 +39,9 @@
                   <object class="GamesFlashBox" id="flash_box">
                     <property name="visible">True</property>
                   </object>
+                  <packing>
+                    <property name="pass-through">True</property>
+                  </packing>
                 </child>
                 <child type="overlay">
                   <object class="GamesSavestatesList" id="savestates_list">