Remove rustfmt workaround

Author: camsteffen

clippy_dev/src/fmt.rs

@@ -60,11 +60,7 @@ pub fn run(check: bool, verbose: bool) {
             let entry = entry?;
             let path = entry.path();
 
-            if path.extension() != Some("rs".as_ref())
-                || entry.file_name() == "ice-3891.rs"
-                // Avoid rustfmt bug rust-lang/rustfmt#1873
-                || cfg!(windows) && entry.file_name() == "implicit_hasher.rs"
-            {
+            if path.extension() != Some("rs".as_ref()) || entry.file_name() == "ice-3891.rs" {
                 continue;
             }