in your update folder in your main folder should be the og dlclist.xml just copy it to your mods folder. you might have to put in various mods back onto the list but as long as you know what you put in it shouldnt be a problem
GTAV>update>update.rpf>common>data
and well if you deleted it from the main folder and not the mod folder you should just try and verify your files through whatever launcher you use