fdo#71434: don't show master text if PlaceHolder types defined

I've added all of valid PlaceHolder types from
http://www.schemacentral.com/sc/ooxml/t-p_ST_PlaceholderType.html

(cherry picked from commit bb1213a740b3b3b2b1967639939dd7a72c6d4237)

Change-Id: I038fe43ff83699f92ff5eb9945bce12540058478
Reviewed-on: https://gerrit.libreoffice.org/6822
Reviewed-by: Muthu Subramanian K <muthusuba@gmail.com>
Tested-by: Muthu Subramanian K <muthusuba@gmail.com>
Reviewed-by: Thorsten Behrens <thb@documentfoundation.org>
Tested-by: Thorsten Behrens <thb@documentfoundation.org>