[No GBP] Actually fix random recipes for real (#95895)

## About The Pull Request
Just the fix parts from #95892
Fixes #95876
## Why It's Good For The Game
## Changelog
🆑
fix: metalgen and secret sauce should now generate properly
/🆑

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Co-authored-by: l0 <-->

code/modules/reagents/chemistry/recipes/special.dm

@@ -44,6 +44,7 @@
 	//creation time, decides if we are random generating or not
 	created = recipe_data ? text2num(recipe_data["timestamp"]) : world.realtime
 	if(daysSince(created) > persistence_period)
+		created = world.realtime
 		recipe_data = null
 
 	//all reagents