fs: remove unused catch bindings

PR-URL: #24079
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Wyatt Preul <wpreul@gmail.com>

Author: cjihrig

lib/fs.js

@@ -209,7 +209,7 @@ function exists(path, callback) {
 
   try {
     fs.access(path, F_OK, suppressedCallback);
-  } catch (err) {
+  } catch {
     return callback(false);
   }
 }
@@ -230,7 +230,7 @@ function existsSync(path) {
   try {
     path = toPathIfFileURL(path);
     validatePath(path);
-  } catch (e) {
+  } catch {
     return false;
   }
   const ctx = { path };