Bookmark Window: Make it resizable

data/gui/manage_bookmarks_window.ui

@@ -60,7 +60,7 @@
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
                     <property name="spacing">6</property>
-                    <property name="layout_style">center</property>
+                    <property name="layout_style">start</property>
                     <child>
                       <object class="GtkButton" id="add_bookmark_button">
                         <property name="label">gtk-add</property>
@@ -102,7 +102,7 @@
                 </child>
               </object>
               <packing>
-                <property name="expand">False</property>
+                <property name="expand">True</property>
                 <property name="fill">True</property>
                 <property name="position">0</property>
               </packing>
@@ -325,7 +325,7 @@
             </child>
           </object>
           <packing>
-            <property name="expand">False</property>
+            <property name="expand">True</property>
             <property name="fill">True</property>
             <property name="position">0</property>
           </packing>