[gnome-nibbles/arnaudb/wip/gtk4: 187/188] Fix UI files style.

[Arnaud B. <arnaudb src gnome org>]

commit 2cb20b3a1b9def8596d3f3ea62939222c850b7b3
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Fri Oct 2 16:01:43 2020 +0200

    Fix UI files style.

 data/ui/controls-grid.ui      | 4 ++--
 data/ui/preferences-dialog.ui | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/data/ui/controls-grid.ui b/data/ui/controls-grid.ui
index 897451c..e676254 100644
--- a/data/ui/controls-grid.ui
+++ b/data/ui/controls-grid.ui
@@ -30,8 +30,8 @@
         <property name="valign">center</property>
         <property name="halign">center</property>
         <property name="vexpand">True</property>
-        <property name="row_spacing">5</property>
-        <property name="column_spacing">5</property>
+        <property name="row-spacing">5</property>
+        <property name="column-spacing">5</property>
         <child>
           <object class="GtkLabel" id="name_label">
             <layout>
diff --git a/data/ui/preferences-dialog.ui b/data/ui/preferences-dialog.ui
index e836a37..b330cac 100644
--- a/data/ui/preferences-dialog.ui
+++ b/data/ui/preferences-dialog.ui
@@ -55,7 +55,7 @@
   </object>
   <template class="PreferencesDialog" parent="GtkWindow">
     <property name="can-focus">False</property>
-<!--    <property name="border_width">5</property>-->
+<!--    <property name="border-width">5</property>-->
     <property name="modal">True</property>
     <property name="icon-name">gnome-nibbles</property>
     <child type="titlebar">
@@ -72,7 +72,7 @@
             <property name="child">
               <object class="GtkBox">
                 <property name="can-focus">False</property>
-    <!--            <property name="border_width">12</property>-->
+    <!--            <property name="border-width">12</property>-->
                 <property name="spacing">6</property>
                 <property name="orientation">vertical</property>
                 <child>
@@ -109,7 +109,7 @@
                     <property name="can-focus">False</property>
                     <property name="row-spacing">0</property>
                     <property name="column-spacing">12</property>
-    <!--                <property name="border_width">0</property>-->
+    <!--                <property name="border-width">0</property>-->
                     <child>
                       <object class="GtkLabel">
                         <!-- Translators: title of a section in the Preferences dialog (1st worm); allows to 
configure the worm color -->