Fix getColumnRows function declaration

regression from commit 457aba54 ("fix some dodgy static vars
in connectivity").

Change-Id: I0ab2162d4fa1b09b537c149c4af0f64a2252b64e

connectivity/source/drivers/evoab2/NDatabaseMetaData.hxx

@@ -64,7 +64,7 @@ namespace connectivity
         {
             OEvoabConnection*                      m_pConnection;
 
-            ODatabaseMetaDataResultSet::ORows& getColumnRows( const OUString& columnNamePattern );
+            ODatabaseMetaDataResultSet::ORows getColumnRows( const OUString& columnNamePattern );
 
         protected:
             virtual css::uno::Reference< css::sdbc::XResultSet > impl_getTypeInfo_throw() override;