"Introduce Constant" inserts a needless "use crate" when extracting to a file scope

[lancelote]

Environment

• IntelliJ Rust plugin version: 0.2.123.SNAPSHOT-201-dev
• Rust toolchain version: 1.43.0 (4fb7144ed 2020-04-20) x86_64-apple-darwin
• IDE name and version: CLion 2020.1.1 (CL-201.7223.86)
• Operating system: macOS 10.15.4

Problem description

Trying to introduce a constant (#4985) to a global file scope results in a wild use crate::X and an error:

Steps to reproduce

fn main() {
    println!("{}", 1 + 1);
}

... call "Introduce Constant" on 1 + 1

use crate::I;

const I: i32 = 1 + 1;

fn main() {
    println!("{}", I);
}