fix(bank_panel): repaint footer mode toggle when Design/Arrange action fires

src/bank_panel.cpp

@@ -3435,6 +3435,10 @@ void bankPanelToggledBanksFullHeight() {
     setFullHeight(BankPanelFullHeight::BanksOnly);
 }
 
+void bankPanelInvalidate() {
+    if (g_panel.hwnd) InvalidateRect(g_panel.hwnd, nullptr, FALSE);
+}
+
 void bankPanelShutdown() {
     closePanel();
     deinitPreview();