tdf#91890:Impress Crash when click on Transition icon in sidebar

Change-Id: I8ea350b97fcbf914b60ba580a72df967fdcfadef
Reviewed-on: https://gerrit.libreoffice.org/16163Reviewed-by: Philippe Jung <phil.jung@free.fr>
Tested-by: Jenkins <ci@libreoffice.org>

sd/uiconfig/simpress/ui/slidetransitionspanel.ui

@@ -20,16 +20,15 @@
         <property name="orientation">vertical</property>
         <property name="spacing">12</property>
         <child>
-          <object class="GtkFrame" id="frame3">
+          <object class="GtkBox" id="box4">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="vexpand">True</property>
-            <property name="label_xalign">0</property>
-            <property name="shadow_type">none</property>
             <child>
               <object class="GtkAlignment" id="alignment3">
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
+                <property name="hexpand">True</property>
                 <property name="vexpand">True</property>
                 <child>
                   <object class="GtkTreeView" id="transitions_list:border">
@@ -42,9 +41,11 @@
                   </object>
                 </child>
               </object>
-            </child>
-            <child type="label_item">
-              <placeholder/>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">True</property>
+                <property name="position">0</property>
+              </packing>
             </child>
           </object>
           <packing>