[frontend] fix compile error (#2767)

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2767
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Co-authored-by: unknown <sahyno1996@gmail.com>
Co-committed-by: unknown <sahyno1996@gmail.com>

src/frontend_common/firmware_manager.cpp

@@ -130,9 +130,9 @@ FirmwareManager::FirmwareCheckResult FirmwareManager::VerifyFirmware(Core::Syste
         }
 
         // TODO: update this whenever newer firmware is properly supported
-        /* if (firmware_data.major > 19) {
+        if (firmware_data.major > 20) {
             return ErrorFirmwareTooNew;
-        } */
+        }
     }
 
     return FirmwareGood;