Fix builds with USE=-lefthk
https://github.com/leftwm/leftwm/commit/e2e35412f113358d9be35e57683d51f5b7008535

--- a/leftwm/src/config/keybind.rs
+++ b/leftwm/src/config/keybind.rs
@@ -6,7 +6,6 @@ use crate::Config;
 use anyhow::{ensure, Context, Result};
 #[cfg(feature = "lefthk")]
 use lefthk_core::config::Command;
-#[cfg(feature = "lefthk")]
 use serde::{Deserialize, Serialize};
 #[cfg(feature = "lefthk")]
 use std::fmt::Write;
