Update git submodules

* Update helpcontent2 from branch 'master'
  - Fix call of main Help page from app Help menu
    
    The Application Help menu sends /<module>/.uno:HelpIndex in the Help
    URL.
    
    This translates to '.uno:HelpIndex' and module name is lost, opening the
    New Help default page instead of the module Help entry page.
    
    The patch picks the right module Help entry page in this particular
    case.
    
    Change-Id: Ifbb5ba4f817b195210fbb19bcb5c2011d2cb416d
    Reviewed-on: https://gerrit.libreoffice.org/68093
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 54a17bfb

-Subproject commit f134b8cd96bcbff338b60d28347328d0e63d67c9
+Subproject commit 54a17bfbc795bedaccd9f1846b1a49d57722b5b4