[nautilus] progress-info-widget: Make button round again

[António Fernandes <antoniof src gnome org>]

commit cec92f898ad4dbe6fa0973034864d0c351455762
Author: António Fernandes <antoniojpfernandes gmail com>
Date:   Thu Nov 25 17:13:13 2021 +0000

    progress-info-widget: Make button round again
    
    The button currently looks like a vertical pill, not a circle.
    
    This is a regression from a2d5dafa056b7ad96747278c4bfabd178eda9547
    
    Not using the GtkButton image API apparently requires us to add the image-button style class ourselves.

 src/resources/ui/nautilus-progress-info-widget.ui | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/resources/ui/nautilus-progress-info-widget.ui 
b/src/resources/ui/nautilus-progress-info-widget.ui
index 3dda2fcd4..ac10a9da8 100644
--- a/src/resources/ui/nautilus-progress-info-widget.ui
+++ b/src/resources/ui/nautilus-progress-info-widget.ui
@@ -52,6 +52,7 @@
         <property name="valign">center</property>
         <property name="margin_start">20</property>
         <style>
+          <class name="image-button"/>
           <class name="circular"/>
         </style>
         <child>