refactor(date): reorder error imports for better organization

Move 'use uucore::error::{UResult, USimpleError};' after the cfg-specific import to group error-related imports together, improving code readability and consistency in the date utility module.

Author: mattsu2020

src/uu/date/src/date.rs

@@ -20,9 +20,9 @@ use std::path::PathBuf;
 use std::sync::OnceLock;
 use uucore::display::Quotable;
 use uucore::error::FromIo;
-use uucore::error::{UResult, USimpleError};
 #[cfg(unix)]
 use uucore::error::UUsageError;
+use uucore::error::{UResult, USimpleError};
 use uucore::translate;
 use uucore::{format_usage, show};
 #[cfg(windows)]