[gnome-games] display-header-bar: Don't style restore button

[Alexander Mikhaylenko <alexm src gnome org>]

commit b7b2948b72db89c520021925047e12e07827ce79
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Oct 9 14:16:12 2019 +0500

    display-header-bar: Don't style restore button
    
    It doesn't work with the new round buttons.

 data/ui/display-header-bar.ui | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/data/ui/display-header-bar.ui b/data/ui/display-header-bar.ui
index 9461a421..969ad3ec 100644
--- a/data/ui/display-header-bar.ui
+++ b/data/ui/display-header-bar.ui
@@ -43,11 +43,9 @@
                 <property name="visible">False</property>
                 <property name="can_focus">False</property>
                 <property name="valign">center</property>
-                <property name="margin-start">7</property>
                 <signal name="clicked" handler="on_restore_clicked"/>
                 <style>
                   <class name="image-button"/>
-                  <class name="titlebutton"/>
                 </style>
                 <child internal-child="accessible">
                   <object class="AtkObject" id="a11y-restore">