tdf#112721 sd ppt export: don't adjust first line of table

Round-tripping ppt files with tables was causing the
text content to slowly creep downward as space was
being added on each save.

No unit test. Something is wrong with saveAndReload for PPT.
Plus, I don't know what property contains this padding,
or whether it is a cell object or what that contains it.

Change-Id: I8918718c4ae2c87856910717c3ca8af1cbd86a6e
Reviewed-on: https://gerrit.libreoffice.org/56690
Tested-by: Jenkins
Reviewed-by: Justin Luth <justin_luth@sil.org>

sd/source/filter/eppt/epptso.cxx

@@ -1087,7 +1087,7 @@ void PPTWriter::ImplWriteTextStyleAtom( SvStream& rOut, int nTextInstance, sal_u
         if ( mnTextSize )
             aTextObj.Write( &rOut );
 
-        if ( pPropOpt )
+        if ( pPropOpt && mType != "drawing.Table" )
             ImplAdjustFirstLineLineSpacing( aTextObj, *pPropOpt );
 
         sal_uInt32 nSize, nPos = rOut.Tell();