Removed 800x600 sized window setting when window can be smaller

ubl-settings-system.glade

@@ -497,8 +497,6 @@ translated and supported by community.</property>
   <object class="GtkWindow" id="MainWindow">
     <property name="width-request">800</property>
     <property name="can-focus">False</property>
-    <property name="default-width">800</property>
-    <property name="default-height">600</property>
     <property name="icon-name">com.ublinux.ubl-settings-system</property>
     <child>
       <object class="GtkBox" id="plugBox">