Fix icon color in light/dark modes

[frankwiles]

• Icon had hard coded color for dark mode and looked all wrong (grey) in light mode.

[frankwiles]

Fixes #2108

[bmispelon]

Thanks for the fix @frankwiles ! ✨

While it's not a big deal for this PR (the change was fairly trivial after all, though I wonder if some other icons might be impacted by a similar issue), please don't merge your own pr without a review next time (ideally from the website working group).

[frankwiles]

Yeah I figured it was ok since it was such a small change, but noted.

This was an icon I added as part of the Package Ecosystem page and not sure if I set the color specifically in that PR or just neglected to change it to currentColor. In any case, the other icons are all set full="currentColor" already so should be zero impact to them.