Auto merge of #4018 - dmtrshat:master, r=Turbo87
Auto merge of #4018 - dmtrshat:master, r=Turbo87

Fix search form submit in Safari

Safari cannot submit a form if the submit button inside it has the `display: none` property.
This is a simple fix 🙃

Fixes #4019

rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io