[Deviantart] [#1776] Remove the "you need session cookies to download mature scraps" warning

[Scripter17]

To my knowledge, gallery-dl can download mature scraps from deviantart without cookies depsite the warning (see #1776 for details)

I haven't tested all the possible edge-cases yet (hence the PR being a draft). I'm putting this here mostly just to get used to pull requests

[Scripter17]

I tested --include scraps, gallery/scraps, gallery?catpath=scraps, and linking to the art directly and they all seem to work without cookies, API keys. or both

I don't think there's any case where this doesn't work

[mikf]

You should also remove lines 893, 897, and 898:

gallery-dl/gallery_dl/extractor/deviantart.py

Line 893 in 1e0f59d

_warning = True

gallery-dl/gallery_dl/extractor/deviantart.py

Lines 897 to 898 in 1e0f59d

	if self._warning:
	DeviantartScrapsExtractor._warning = False

[Scripter17]

There wouldn't happen to be any reference to mature scraps needing cookies in the documentation, would there?

I'm doing a quick scan just to check but I'm pretty sure it's mostly just issues that refer to it

[mikf]

I don't think so. This warning was the only thing about dA cookies.