cargo-credential-1password: Add missing --account argument to `op s…

…ignin` command

Without this the account chooser is shown by the `op signin` command, even though the user has already specified an account via the `--account` command line argument to the `cargo-credential-1password` CLI.

Note that the `--vault` in this case does not need to be forwarded to `op`, since it is irrelevant for the `op signin` command.

credential/cargo-credential-1password/src/main.rs

@@ -79,6 +79,10 @@ impl OnePasswordKeychain {
         }
         let mut cmd = Command::new("op");
         cmd.args(["signin", "--raw"]);
+        if let Some(account) = &self.account {
+            cmd.arg("--account");
+            cmd.arg(account);
+        }
         cmd.stdout(Stdio::piped());
         let mut child = cmd
             .spawn()