tdf120224 docx export: don't double up field bookmarks

fields are internal bookmarks. When the exporter runs
through the bookmarks, it will already write out a bookmark
entry, so don't output a separate one for the fieldmark.

Change-Id: I84af2989035507ac745d028f1585d60d8823ff8b
Reviewed-on: https://gerrit.libreoffice.org/61616
Tested-by: Jenkins
Reviewed-by: Justin Luth <justin_luth@sil.org>
diff --git a/sw/source/filter/ww8/wrtw8nds.cxx b/sw/source/filter/ww8/wrtw8nds.cxx
index 3235363..533f787 100644
--- a/sw/source/filter/ww8/wrtw8nds.cxx
+++ b/sw/source/filter/ww8/wrtw8nds.cxx
@@ -2327,8 +2327,11 @@ void MSWordExportBase::OutputTextNode( SwTextNode& rNode )
                    ::sw::mark::IFieldmark const * const pFieldmark = pMarkAccess->getFieldmarkFor( aPosition );
                    OSL_ENSURE( pFieldmark, "Looks like this doc is broken...; where is the Fieldmark for the FIELDSTART??" );

                    if ( pFieldmark && pFieldmark->GetFieldname() == ODF_FORMTEXT )
                        AppendBookmark( pFieldmark->GetName() );
                    if ( pFieldmark && pFieldmark->GetFieldname() == ODF_FORMTEXT
                         && GetExportFormat() != MSWordExportBase::ExportFormat::DOCX )
                    {
                       AppendBookmark( pFieldmark->GetName() );
                    }
                    ww::eField eFieldId = lcl_getFieldId( pFieldmark );
                    OUString sCode = lcl_getFieldCode( pFieldmark );
                    if ( pFieldmark && pFieldmark->GetFieldname() == ODF_UNHANDLED )
@@ -2391,8 +2394,11 @@ void MSWordExportBase::OutputTextNode( SwTextNode& rNode )

                    OutputField( nullptr, eFieldId, OUString(), FieldFlags::Close );

                    if ( pFieldmark && pFieldmark->GetFieldname() == ODF_FORMTEXT )
                    if ( pFieldmark && pFieldmark->GetFieldname() == ODF_FORMTEXT
                         && GetExportFormat() != MSWordExportBase::ExportFormat::DOCX )
                    {
                        AppendBookmark( pFieldmark->GetName() );
                    }
                }
                else if ( ch == CH_TXT_ATR_FORMELEMENT )
                {