Update steam-enhancement-pack.nsi

[Unknow0059]

Allowed individual selection of graphic mods in the configurations 1, 1+2, or 1+2+3.
This does also affect gog-enhancement-pack.nsi.

AI Disclosure: AI was used in the making of this code change. Proceedings at link. I've tested the change, confirmed it to have the intended effect (1+2), and to be playable.

[mulderf0x]

Hi, and thanks for the PR :)

I see what you're doing here. Interesting NSIS trick :)
And I know some people want what you're doing here.

However, there is an issue with merging this as-is because of the way my repacks are structured.

I "shrunk" the HD Mods and SHDPs to avoid having the same texture files duplicated across multiple packs. For example, if the same texture was present in Packs A, B, and C, I removed it from Pack A and/or B since Pack C is always installed.

We could of course just forget about my repacks and use the official packs from ModDB directly. That would mean downloading the video files twice if the user chooses the SourceNext videos, but I don't think many people choose that option.

[mulderf0x]

FYI if you rename your branch with "pre/" prefix, like pre/re3 it should trigger a build automatically.