enhanced CartCDF, now ignores random startup banks (partially addresses #690)

src/emucore/Cart.hxx

@@ -354,7 +354,7 @@ class Cartridge : public Device
 
       @return  Whether the startup bank(s) should be randomized
     */
-    bool randomStartBank() const;
+    virtual bool randomStartBank() const;
 
   protected:
     // Settings class for the application

src/emucore/CartCDF.hxx

@@ -183,6 +183,13 @@ class CartridgeCDF : public Cartridge
     bool poke(uInt16 address, uInt8 value) override;
 
   private:
+    /**
+      Checks if startup bank randomization is enabled.
+
+      @return  Whether the startup bank(s) should be randomized
+    */
+    bool randomStartBank() const override { return false; };
+
     /**
       Sets the initial state of the DPC pointers and RAM
     */