virtio-video: use to_vec() to copy &Vec
virtio-video: use to_vec() to copy &Vec

Fixes a Rust 1.60 clippy lint:

  error: called `iter().copied().collect()` on a slice to create a
  `Vec`. Calling `to_vec()` is both faster and more readable

BUG=b:239075544
TEST=tools/clippy # with rust-toolchain = 1.60.0

Change-Id: I37ac1b5708ed5f8a1ac5487225fe2ee8fb6486ad
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3764422
Tested-by: Daniel Verkamp <72bc170b46ec491f7bdd4359a1c0bfed274de40c@chromium.org>
Commit-Queue: Daniel Verkamp <72bc170b46ec491f7bdd4359a1c0bfed274de40c@chromium.org>
Reviewed-by: Alexandre Courbot <301cd6a3ea50a894b4b51e385c5eb12b9a4ffc0c@chromium.org>

google/crosvm,google/crosvm,google/crosvm,google/crosvm