tdf#140590 Crash in Save-As dialog in Tools>Chapter Numbering

This would only affect assert builds. The assert condition
here did not match the condition in createFastChildContext
several lines below.

Bug since this code was introduced in
    commit 1535f39388223de53e4b923c6f7bb71ee32c1858
    Date:   Fri Nov 7 19:11:11 2014 +0100
    sw: store Outline Numbering as ODF fragment instead of SfxPoolItems

Change-Id: I3f6a0b91e3c17f4ca358a75116481fc38c01e94e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/112233
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
diff --git a/sw/source/uibase/config/StoredChapterNumbering.cxx b/sw/source/uibase/config/StoredChapterNumbering.cxx
index eb97b1c..07e6884 100644
--- a/sw/source/uibase/config/StoredChapterNumbering.cxx
+++ b/sw/source/uibase/config/StoredChapterNumbering.cxx
@@ -320,7 +320,7 @@

    virtual void SAL_CALL endFastElement(sal_Int32 /*Element*/) override
    {
        assert(m_Contexts.size() < SwChapterNumRules::nMaxRules);
        assert(m_Contexts.size() <= SwChapterNumRules::nMaxRules);
        for (auto iter = m_Contexts.begin(); iter != m_Contexts.end(); ++iter)
        {
            uno::Reference<container::XIndexReplace> const xRule(