For a new document the default is already effectively "false" due to
SwDocShell::InitNew() and the ODF and WW8 filters set it explicitly to
false... which is also the appropriate value for RTF and DOCX.

But only OOoXML and (perhaps) HTML (not sure) want "true" as the
default.

It is also mysteriously reset to "true" in
SwDoc::RemoveAllFmtLanguageDependencies() (which is called after loading
a template) for no apparent reason.

Change-Id: If5ad33c99f97412cb3ad4f9cec32f47825ed6f6b