Correct misc TODOs in monero-serai

coins/monero/ringct/bulletproofs/build.rs

@@ -43,10 +43,10 @@ fn generators(prefix: &'static str, path: &str) {
           static GENERATORS_CELL: OnceLock<Generators> = OnceLock::new();
           pub(crate) fn GENERATORS() -> &'static Generators {{
             GENERATORS_CELL.get_or_init(|| Generators {{
-              G: vec![
+              G: std_shims::vec![
                 {G_str}
               ],
-              H: vec![
+              H: std_shims::vec![
                 {H_str}
               ],
             }})

coins/monero/ringct/bulletproofs/src/plus/mod.rs

@@ -1,6 +1,6 @@
 #![allow(non_snake_case)]
 
-use std_shims::{sync::OnceLock, vec};
+use std_shims::sync::OnceLock;
 
 use curve25519_dalek::{constants::ED25519_BASEPOINT_POINT, scalar::Scalar, edwards::EdwardsPoint};