Fix rpak aliasing not working when trying to alias towards a vanilla rpak (#825)

Replace incorrect variable with hardcoded `-1`
Don't account for the modded path in pak aliases

Author: ASpoonPlaysGames

primedev/core/filesystem/rpakfilesystem.cpp

@@ -342,15 +342,15 @@ void PakLoadManager::UnloadDependentPaks(PakHandle handle)
 static void HandlePakAliases(std::string& originalPath)
 {
 	// convert the pak being loaded to its aliased one, e.g. aliasing mp_hub_timeshift => sp_hub_timeshift
-	for (int64_t i = g_pModManager->m_LoadedMods.size() - 1; i > PakHandle::INVALID; i--)
+	for (int64_t i = g_pModManager->m_LoadedMods.size() - 1; i > -1; i--)
 	{
 		Mod* mod = &g_pModManager->m_LoadedMods[i];
 		if (!mod->m_bEnabled)
 			continue;
 
 		if (mod->RpakAliases.find(originalPath) != mod->RpakAliases.end())
 		{
-			originalPath = (mod->m_ModDirectory / "paks" / mod->RpakAliases[originalPath]).string();
+			originalPath = mod->RpakAliases[originalPath];
 			return;
 		}
 	}