[OAuth] Fix copy/paste (probably?) mistake

src/oauth.rs

@@ -47,7 +47,7 @@ fn full_key(prefix: &str, key: &str) -> String {
 }
 
 fn get_client<E: Copy>(conf: Config, prefix: &str, error_value: E) -> Result<BasicClient, E> {
-    let client_id = ClientId::new(get_or_error(&conf, &full_key(prefix, "client_secret"), error_value)?);
+    let client_id = ClientId::new(get_or_error(&conf, &full_key(prefix, "client_id"), error_value)?);
     let client_secret = match get_optional(&conf, &full_key(prefix, "client_secret")) {
         Some(v) => Some(ClientSecret::new(v)),
         None => None,