LibreOffice.natvis: a small correction

Change-Id: I6f9971bf3fc8eec996a19c0a56202947f65a07ae
Reviewed-on: https://gerrit.libreoffice.org/44972Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Mike Kaganski <mike.kaganski@collabora.com>

solenv/vs/LibreOffice.natvis

@@ -117,7 +117,7 @@
     </Expand>
   </Type>
   <Type Name="BigPtrArray">
-    <DisplayString>{{{m_nSize} nodes}}</DisplayString>
+    <DisplayString>{{{m_nSize,d} nodes}}</DisplayString>
     <Expand>
       <CustomListItems>
         <!-- Visualiser needs to know the type of variable (including pointer type).