[gtk] Revert a non-working addition

[Timm Bäder <baedert src gnome org>]

commit 2d57cb6ce372970f33421211aef455c9322a21f8
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jan 13 21:56:00 2019 -0500

    Revert a non-working addition
    
    Cell rendererers don't support <style> in ui files.

 gtk/ui/gtkappchooserwidget.ui | 3 ---
 1 file changed, 3 deletions(-)
---
diff --git a/gtk/ui/gtkappchooserwidget.ui b/gtk/ui/gtkappchooserwidget.ui
index 484599d16a..203837c3be 100644
--- a/gtk/ui/gtkappchooserwidget.ui
+++ b/gtk/ui/gtkappchooserwidget.ui
@@ -59,9 +59,6 @@
                     </child>
                     <child>
                       <object class="GtkCellRendererPixbuf" id="app_icon">
-                        <style>
-                          <class name="lowres-icon"/>
-                        </style>
                         <property name="stock-size">5</property>
                       </object>
                       <attributes>