Resolves: tdf#106732 the intent was surely to return a const ref

Change-Id: Iaaa1f76a689645adaebf4fe5b87003ad238f71f2
diff --git a/include/svtools/insdlg.hxx b/include/svtools/insdlg.hxx
index 5e18693..58bada8 100644
--- a/include/svtools/insdlg.hxx
+++ b/include/svtools/insdlg.hxx
@@ -60,7 +60,7 @@ public:
                                return aObjectServerList.size();
                            }

    const SvObjectServer    operator[]( size_t n ) const
    const SvObjectServer&   operator[]( size_t n ) const
                            {
                                return aObjectServerList[ n ];
                            }