Update git submodules

* Update helpcontent2 from branch 'master'
  to b3ffed2bfd797c22fe28472898d2d9a72aa2ae41
  - Update screenshot for simpress/presentationdialog.ui
    
    Change-Id: Ie514503c603cd1c40917486a5f5c2096301a3f94
    Reviewed-on: https://gerrit.libreoffice.org/c/help/+/167910
    Tested-by: Jenkins
    Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    
diff --git a/helpcontent2 b/helpcontent2
index bfc9b74..b3ffed2 160000
--- a/helpcontent2
+++ b/helpcontent2
@@ -1 +1 @@
Subproject commit bfc9b74f251bd2aca3605732c30b61bd6715a7eb
Subproject commit b3ffed2bfd797c22fe28472898d2d9a72aa2ae41