This fixes the auto-update failure by ensuring cargo-bundle picks 'zed'
as the first binary.

**Problem:** `cargo metadata` returns binaries alphabetically, so
`visual_test_runner` was coming before `zed`. When cargo-bundle looks
for the first binary to bundle (without `--bin`), it was picking
`visual_test_runner` - which doesn't exist in release builds because it
requires the `visual-tests` feature.

The previous fix (#46163) added `--bin zed` to explicitly select the
binary, but this caused cargo-bundle to use the binary name ('zed')
instead of the bundle metadata name ('Zed Nightly'), breaking
auto-updates.

**Fix:** Rename the binary to `zed_visual_test_runner` so it comes after
`zed` alphabetically. This restores the original bundle script behavior
that has worked for years.

Also reverts the `--bin zed` workaround from #46163.

Release Notes:

- N/A