Work around workaround for old MSVC 2012
Work around workaround for old MSVC 2012

...not allowing certain o3tl::is_typed_flags::Wrap conversion operators to be
explicit, thus causing ambiguities here.

Change-Id: I5108885229eb185ceac57042e67405b393cdcf3b

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core