Buttons are missing with 1024x600 display resolution

Same as #89 (closed). adriconf v2.5.1 works well with this patch: (I can't successfully build the master branch on my system.)

diff --git a/adriconf/DriConf.glade b/adriconf/DriConf.glade
index b267797..2723243 100644
--- a/adriconf/DriConf.glade
+++ b/adriconf/DriConf.glade
@@ -3,11 +3,11 @@
 <interface>
   <requires lib="gtk+" version="3.20"/>
   <object class="GtkApplicationWindow" id="mainwindow">
-    <property name="width-request">1024</property>
-    <property name="height-request">700</property>
+    <property name="width-request">800</property>
+    <property name="height-request">450</property>
     <property name="can-focus">False</property>
-    <property name="default-width">1024</property>
-    <property name="default-height">700</property>
+    <property name="default-width">800</property>
+    <property name="default-height">450</property>
     <child>
       <object class="GtkBox">
         <property name="visible">True</property>
@@ -34,8 +34,8 @@
                     <property name="can-focus">False</property>
                     <child>
                       <object class="GtkFlowBox" id="profileList">
-                        <property name="width-request">1024</property>
-                        <property name="height-request">762</property>
+                        <property name="width-request">800</property>
+                        <property name="height-request">450</property>
                         <property name="visible">True</property>
                         <property name="can-focus">False</property>
                         <property name="halign">start</property>