Fix tidy

Author: blyxyas

compiler/rustc_lint/src/unused.rs

@@ -1027,7 +1027,7 @@ pub(crate) struct UnusedParens {
 }
 
 impl Default for UnusedParens {
-    fpub(crate) fn default() -> Self {
+    pub(crate) fn default() -> Self {
         Self { with_self_ty_parens: false, parens_in_cast_in_lt: Vec::new() }
     }
 }