Changed the content rating of /c/metallica

Hey! Sorry, not sure how I missed this community.

I’ve just changed the content rating of it from nsfw to sfw. Nsfw is really meant more risqué images and videos, and limited the visibility of the community to 18+ only.

Let me know if you want me to switch it back, else I think this makes the most sense for the community.

(I need to do a better job at clarifying the content ratings during creation)