Related: tdf#130108 ensure we don't reuse the last SetSearchMask setting

Conditional style formats can only be SfxStyleFamily::Para formats
as far as I see, and presumably we don't want to reuse any previous
SetSearchMask settings here in xml export, so this looks like a dup
of the same problem of

commit 454a3c945fdc02d706b0a5ad49ca13e0443fa8e5
Date:   Sun May 3 16:43:06 2020 +0100

    Resolves: tdf#130108 ensure we don't reuse the last SetSearchMask setting

Change-Id: Ic26b450068bd1e13a3c82b1c1466630402498787
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/93453
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/sc/source/filter/excel/xeextlst.cxx b/sc/source/filter/excel/xeextlst.cxx
index 0b2efd9..50ef715 100644
--- a/sc/source/filter/excel/xeextlst.cxx
+++ b/sc/source/filter/excel/xeextlst.cxx
@@ -153,7 +153,7 @@ void XclExpExtCF::SaveXml( XclExpXmlStream& rStrm )
{
    OUString aStyleName = mrFormat.GetStyle();
    SfxStyleSheetBasePool* pPool = GetDoc().GetStyleSheetPool();
    SfxStyleSheetBase* pStyle = pPool->Find(aStyleName, pPool->GetSearchFamily(), pPool->GetSearchMask());
    SfxStyleSheetBase* pStyle = pPool->Find(aStyleName, SfxStyleFamily::Para);
    SfxItemSet& rSet = pStyle->GetItemSet();

    std::unique_ptr<ScTokenArray> pTokenArray(mrFormat.CreateFlatCopiedTokenArray(0));