update keyboard shortcuts

src/ui/BuildButtonGrid.h

@@ -6,6 +6,7 @@
 #include <QWidget>
 
 #include "BuilderModeExitedEvent.h"
+#include "BuildHotkeyPressedEvent.h"
 #include "BuildingType.h"
 #include "DemolishModeChangedEvent.h"
 #include "EventHandler.h"
@@ -15,7 +16,8 @@ class QPushButton;
 
 class BuildButtonGrid : public QWidget,
                         public CombinedEventHandler<BuilderModeExitedEvent,
-                                                    DemolishModeChangedEvent>
+                                                    DemolishModeChangedEvent,
+                                                    BuildHotkeyPressedEvent>
 {
     Q_OBJECT
 
@@ -29,6 +31,7 @@ public:
 private:
     void handleEvent(std::shared_ptr<const BuilderModeExitedEvent> event) override;
     void handleEvent(std::shared_ptr<const DemolishModeChangedEvent> event) override;
+    void handleEvent(std::shared_ptr<const BuildHotkeyPressedEvent> event) override;
 
 private slots:
     void onBuildButton(int index);