Upgrade to C++20

Author: guanlisheng

src/filterdlg.cpp

@@ -259,7 +259,7 @@ void wxFilterDialog::OnOkClick(wxCommandEvent& event)
         m_Statement = m_filter->GetText();
         if (!m_Statement.IsEmpty())
         {
-            wxString base = m_Base.IsEmpty() ? "main" : m_Base;
+            wxString base = m_Base.IsEmpty() ? wxString("main") : m_Base;
             wxString sql = "EXPLAIN SELECT *\r";
             sql += "FROM " + base + "." + m_Table + "\r";
             sql += "WHERE " + m_Statement + ";";

src/sqliteplusframe.cpp

@@ -2143,7 +2143,7 @@ void wxSQLitePlusFrame::CreateTrigger(const wxString& dbname, bool useobj,
         if (book)
         {
             book->ExecQuery(createTriggerDlg.GetCreateTriggerDDL());
-            RefreshTriggers(createTriggerDlg.GetTemporary() ? ("main") : dbname);
+            RefreshTriggers(createTriggerDlg.GetTemporary() ? _("main") : dbname);
             m_TreeCtrl->Refresh();
             m_TreeCtrl->Update();
         }