fix for fdo#39792: changes to range names invalidate stream too

If we don't invalidate the table stream when we change the local range
name, the new range name will only be written if something else has been
changed in the sheet

sc/source/core/data/table2.cxx

@@ -3054,6 +3054,10 @@ void ScTable::SetRangeName(ScRangeName* pNew)
 {
     delete mpRangeName;
     mpRangeName = pNew;
+
+    //fdo#39792: mark stream as invalid, otherwise new ScRangeName will not be written to file
+    if (IsStreamValid())
+        SetStreamValid(false);
 }
 
 ScRangeName* ScTable::GetRangeName() const