only recalculate extended access point checksum when firmware is a DSi one

src/SPI_Firmware.cpp

@@ -364,10 +364,13 @@ void SPI_Firmware::Firmware::UpdateChecksums()
         ap.UpdateChecksum();
     }
 
+    if (Header().ConsoleType == FirmwareConsoleType::DSi)
+    {
         for (SPI_Firmware::ExtendedWifiAccessPoint& eap : ExtendedAccessPoints())
         {
             eap.UpdateChecksum();
         }
+    }
 
     for (SPI_Firmware::UserData& u : UserData())
     {