Fixed main window's moving beyond monitor borders

ubl-settings-resourcequota.glade

@@ -2695,12 +2695,11 @@ translated and supported by community.</property>
     </child>
   </object>
   <object class="GtkWindow" id="MainWindow">
-    <property name="width-request">640</property>
-    <property name="height-request">500</property>
+    <property name="width-request">800</property>
+    <property name="height-request">600</property>
+    <property name="visible">True</property>
     <property name="can-focus">False</property>
-    <property name="window-position">center</property>
     <property name="icon-name">com.ublinux.ubl-settings-resourcequota</property>
-    <property name="gravity">center</property>
     <child>
       <object class="GtkBox" id="plugBox">
         <property name="visible">True</property>