fix(sysmodule): unload unknown module ids as no-ops

sceSysmoduleLoadModule and sceSysmoduleIsLoaded already accept ids the
project does not know and log them; unloading such an id threw, so a title
that loads and later unloads an unknown module aborted at the unload.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

core/libs/prx/libSceSysmodule/Export.cpp

@@ -154,7 +154,8 @@ int APS5_VABI sceSysmoduleUnloadModule(std::uint16_t id) {
         throw std::runtime_error("sceSysmoduleUnloadModule: invalid id 0");
     }
     if (!findModuleName(id)) {
-        throw std::runtime_error(std::string("sceSysmoduleUnloadModule: unknown id ") + std::to_string(id));
+        APS5_LOG_OUT("unknown id: %u", static_cast<unsigned>(id));
+        return 0;
     }
     std::lock_guard<std::mutex> lock(gMutex);
     auto it = gLoadCount.find(id);