twinkle: vector-2022: hovering should open menu

[NovemLinguae]

Fix #1674

This has a side effect of also making the "More" menu stay open on hover in vector-2022. Not sure if this is desirable, or if we should change the CSS to target the TW menu only.

[nardog]

I don't think Twinkle should alter the UX of what's not Twinkle. Given the size of Twinkle users, many would mistake it's part of the skin or the site CSS, and misunderstandings among users and developers would ensue.

We should change the CSS to target the TW menu only if we are to hard-code it at all, but I think it's better to make this CSS a gadget on its own, thus giving users more choice and consistency. We already have a number of gadgets for "bring back X" anyway.

[NovemLinguae]

Patch updated to only target the TW menu.

[nardog]

Just #p-twinkle:hover > .vector-menu-content would do also.

[NovemLinguae]

Went to go merge this today after some conversation at WT:TWINKLE, but the patch is no longer working on testwiki. @nardog do you have time to take a look?

[NovemLinguae]

OK, I got this working but this branch/PR needs a rebase. I've never gotten a GitHub PR to rebase successfully though. If anyone has any tricks let me know. For now am going to try the following and maybe some other stuff:

VS Code -> checkout master
VS Code -> pull
VS Code -> checkout the PR (the VS Code GitHub app names the branch pr/NovemLinguae/1676)
git rebase origin/mastrer
git push --force origin pr/NovemLinguae/1676