Move unnecessary_struct_initialization to nursery

[Alexendoo]

changelog: none, assuming it makes into the same release as #10489

Mostly because of #10547 but there is also #10548

[rustbot]

r? @dswij

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[flip1995]

Thanks!

@bors r+

Side note: I find this lint a bit weird in the first place. S { ..a } is not really a syntax Rust beginners are aware of IMO. So if someone uses this unusual way to initialize a struct, there is probably a good reason why they didn't use just a. The only other reason I can think of where this could happen is during a refactor removing a struct field. But then again, wouldn't you already notice this during the refactor? 🤔

[bors]

📌 Commit a6f56cb has been approved by flip1995

It is now in the queue for this repository.

[bors]

⌛ Testing commit a6f56cb with merge 5698f43...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: flip1995
Pushing 5698f43 to master...