bottom margin of nested lists adds up

[ghost]

When using multiple lists within each other, their bottom margin can add up at the end. Found by sseeberg.

[svenseeberg]

 <sect1 xml:id="myid">
  <title>my title</title>
  <itemizedlist mark="bullet" spacing="normal">
   <listitem>
    <para>
     ...
    </para>
    <itemizedlist>
     <listitem>
      <para>
       ...
      </para>
      <itemizedlist>
       <listitem>
        <para>
         ...
        </para>
       </listitem>
      </itemizedlist>
     </listitem>
    </itemizedlist>
   </listitem>
  </itemizedlist>
 </sect1>

[tomschr]

Looks fine in suse2022 stylesheets. Closing.