[gtk/arnaudb/better-substitution] Fix --3to4 tests for margin substitution.

[Arnaud B. <arnaudb src gnome org>]

commit e8b2aff5d609eedfbe49c623b5d60b9ed62f8d8f
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sun Apr 12 18:38:13 2020 +0200

    Fix --3to4 tests for margin substitution.

 testsuite/tools/simplify-data-3to4/grid.expected | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/testsuite/tools/simplify-data-3to4/grid.expected 
b/testsuite/tools/simplify-data-3to4/grid.expected
index bf48a55268..3ab01832dc 100644
--- a/testsuite/tools/simplify-data-3to4/grid.expected
+++ b/testsuite/tools/simplify-data-3to4/grid.expected
@@ -10,10 +10,10 @@
             <property name="receives_default">1</property>
             <property name="vexpand">1</property>
             <property name="hexpand">1</property>
+            <property name="margin-start">10</property>
+            <property name="margin-end">10</property>
             <property name="margin-top">10</property>
-            <property name="margin-right">10</property>
             <property name="margin-bottom">10</property>
-            <property name="margin-left">10</property>
             <layout>
               <property name="left_attach">0</property>
               <property name="top_attach">0</property>