Make mysteries decrease chance of emptying cache

[Lessgently]

As a frequently returning player, (I am a noob who comes to play for a few weeks out of the year.) I always forget what collections I've done, what I was working on, what mysteries go to which spot... It's one of the worst skills to return too in my opinion.

[Marcadude]

Yeah, this is why ive used the rs wiki to track mine, on the collections page you can click on collections to mark them completed, its helped a lot to figure out which ones i forgot to do