[gnome-boxes] wizard-downloadable-entry: Align with install_rhel_button

[Felipe Borges <felipeborges src gnome org>]

commit 49011d24cb37ac807f7cf94f14ab55bff7554274
Author: Felipe Borges <felipeborges gnome org>
Date:   Mon Nov 27 13:34:11 2017 +0100

    wizard-downloadable-entry: Align with install_rhel_button
    
    The install_rhel_button is not actually a GtkListBoxRow like
    WizardDownloadableEntry is. Therefore it has slightly different
    alignment and spacing defaults.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=790614

 data/ui/wizard-downloadable-entry.ui |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/data/ui/wizard-downloadable-entry.ui b/data/ui/wizard-downloadable-entry.ui
index 6c24290..1a99340 100644
--- a/data/ui/wizard-downloadable-entry.ui
+++ b/data/ui/wizard-downloadable-entry.ui
@@ -15,8 +15,8 @@
         <child>
           <object class="GtkBox" id="hbox">
             <property name="visible">True</property>
-            <property name="margin-start">15</property>
-            <property name="margin-end">15</property>
+            <property name="margin-start">20</property>
+            <property name="margin-end">20</property>
             <property name="spacing">20</property>
             <property name="orientation">horizontal</property>
             <child>