Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 39f1403b2e4cbe8bc6189c3ff132d12d558bf0fa
  - style: optimize the style of the create dialog
    
    Change-Id: If8f27ebee4717ac7b49b4f7511d1aee859ad0ced
    Issue-ID: USECASEUI-307
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
1 file changed