fix table inspector showed details of wrong table.

Caused by using a proxy index with a function that needed an index that was mapped to the source.
Fow now mostly fixed by introducing multiple functions with clearer naming and using the correct one
but would prefer when the helper could hide the details of there being two index spaces.

pglab/widgets/CatalogTablesPage.cpp

@@ -118,7 +118,7 @@ void CatalogTablesPage::setNamespaceFilter(NamespaceFilter filter)
 void CatalogTablesPage::tableListTable_currentRowChanged(const QModelIndex &current, const QModelIndex &previous)
 {
 	if (current.row() != previous.row()) {
-        auto table = m_tablesTableView.rowItem(current.row());
+        auto table = m_tablesTableView.rowItemForProxyIndex(current);
         selectedTableChanged(table);
     }
 }