Extracted ISOs: Fix savedata size not showing on the game info screen

`PSP_DISC_DIRECTORY` was the only `IdentifiedFileType` with possible `PARAM.SFO` that didn't mark `PARAM_SFO` ready inside the switch,
causing `GetSaveDataDirectories` to bail out and return an empty vector and the game info UI to show no savedata size info.

UI/GameInfoCache.cpp

@@ -781,6 +781,7 @@ handleELF:
 						std::lock_guard<std::mutex> lock(info_->lock);
 						info_->paramSFO.ReadSFO((const u8 *)paramSFOcontents.data(), paramSFOcontents.size());
 						info_->ParseParamSFO(info_->fileType);
+						info_->MarkReadyNoLock(GameInfoFlags::PARAM_SFO);
 					}
 				}