refactor: consolidate imports for get_*_engine functions

src/modes/diff.rs

@@ -1,5 +1,4 @@
-use crate::compression_engine::CompressionType;
-use crate::compression_engine::get_compression_engine;
+use crate::compression_engine::{CompressionType, get_compression_engine};
 use libc::c_int;
 use std::path::PathBuf;
 use std::str::FromStr;