tdf#72440 Abs sheet ref must be given

When resolving tdf#90799, sheet ref was forced abs
But its value must be changed.
It worked only if initial sheet = Sheet1

Change-Id: I715f93dce93beb78d767e00dd45fb9634cb173a8
Reviewed-on: https://gerrit.libreoffice.org/49548Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins <ci@libreoffice.org>

sc/source/ui/formdlg/formula.cxx

@@ -448,8 +448,9 @@ void ScFormulaDlg::SetReference( const ScRange& rRef, ScDocument* pRefDoc )
             bool bSingle = aRefData.Ref1 == aRefData.Ref2;
             if (m_CursorPos.Tab() != rRef.aStart.Tab())
             {
+                // pointer-selected => absolute sheet reference
+                aRefData.Ref1.SetAbsTab( rRef.aStart.Tab() );
                 aRefData.Ref1.SetFlag3D(true);
-                aRefData.Ref1.SetTabRel(false);     // pointer-selected => absolute sheet reference
             }
             if (bSingle)
                 aArray.AddSingleReference(aRefData.Ref1);