Restore the obsolete pause resume alt opcode.

As a redirect to the SCSI Pause/Resume 0x4B command.

src/scsi/scsi_cdrom.c

@@ -3524,6 +3524,7 @@ atapi_out:
             break;
 
         case GPCMD_PAUSE_RESUME:
+        case GPCMD_PAUSE_RESUME_ALT:
             scsi_cdrom_set_phase(dev, SCSI_PHASE_STATUS);
             cdrom_audio_pause_resume(dev->drv, cdb[8] & 0x01);
             scsi_cdrom_command_complete(dev);