scripts: generate_rust_analyzer: fix pin-init name in kernel deps

Because of different crate names ("pin-init" and "pin_init") passed to
"append_crate" and "append_crate_with_generated", the script fails with
"KeyError: 'pin-init'".

To overcome the issue, pass the same name to both functions.

Signed-off-by: Andrei Lalaev <andrei.lalaev@anton-paar.com>
Link: https://lore.kernel.org/r/AM9PR03MB7074692E5D24C288D2BBC801C8AD2@AM9PR03MB7074.eurprd03.prod.outlook.com
Fixes: 4e82c870 ("Merge tag 'rust-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linux"

)
[ Made author match the Signed-off-by one. Added newline. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>