Resolves: tdf#126691 width/height considered changed, but it didn't

regression from...

commit c4041a3b6c703254ee3977eef1a989992506772b
Author: Caolán McNamara <caolanm@redhat.com>
Date:   Mon May 28 14:33:42 2018 +0100

    weld SvxSwPosSizeTabPage

Change-Id: Ib8a5359a1aee9ac7b645621b9de9311cd56449f5
Reviewed-on: https://gerrit.libreoffice.org/77123
Tested-by: Jenkins
Reviewed-by: Xisco Faulí <xiscofauli@libreoffice.org>
diff --git a/cui/source/tabpages/swpossizetabpage.cxx b/cui/source/tabpages/swpossizetabpage.cxx
index d5c536d..df4b033 100644
--- a/cui/source/tabpages/swpossizetabpage.cxx
+++ b/cui/source/tabpages/swpossizetabpage.cxx
@@ -994,10 +994,12 @@ void SvxSwPosSizeTabPage::Reset( const SfxItemSet* rSet)
    sal_Int32 nWidth = std::max( pItem ? ( static_cast<const SfxUInt32Item*>(pItem)->GetValue()) : 0, sal_uInt32(1) );

    m_xWidthMF->set_value(m_xWidthMF->normalize(nWidth), FieldUnit::TWIP);
    m_xWidthMF->save_value();

    pItem = GetItem( *rSet, SID_ATTR_TRANSFORM_HEIGHT );
    sal_Int32 nHeight = std::max( pItem ? ( static_cast<const SfxUInt32Item*>(pItem)->GetValue()) : 0, sal_uInt32(1) );
    m_xHeightMF->set_value(m_xHeightMF->normalize(nHeight), FieldUnit::TWIP);
    m_xHeightMF->save_value();
    m_fWidthHeightRatio = double(nWidth) / double(nHeight);

    if(!m_bPositioningDisabled)