panel: Remove unneeded lib.name field in Cargo.toml (#24301)

This PR removes the `name` field from under `lib` in the `Cargo.toml`
file for the `panel` crate, as it isn't necessary.

Also removed it from `script/new-crate`.

Release Notes:

- N/A

crates/panel/Cargo.toml

@@ -9,13 +9,9 @@ license = "GPL-3.0-or-later"
 workspace = true
 
 [lib]
-name = "panel"
 path = "src/panel.rs"
 
 [dependencies]
 gpui.workspace = true
 ui.workspace = true
 workspace.workspace = true
-
-[features]
-default = []