Compile warnings in components/script/dom/

[Oriol Brufau]

After #31921 I get some compile warnings

warning: unused import: `std::mem`
 --> components/script/dom/canvasrenderingcontext2d.rs:5:5
  |
5 | use std::mem;
  |     ^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: unused import: `std::mem::replace`
 --> components/script/dom/htmlscriptelement.rs:9:5
  |
9 | use std::mem::replace;
  |     ^^^^^^^^^^^^^^^^^

@oluwatobiss Please make sure to not introduce compile warnings

[Oluwatobi Sofela]

Got it. Thanks, @azharcodeit, for fixing it.