Rollup merge of #52527 - ljedrz:cleanup_13973, r=oli-obk
Rollup merge of #52527 - ljedrz:cleanup_13973, r=oli-obk

Remove duplicate E0396 tests

Resolves FIXME #13973 (erroneously marked as #13972). A test for E0396 already exists in `test/ui/const-deref-ptr.rs`.

graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,GBGamer/rust