reverted add-slash change in heuristics

src/heuristics.rs

@@ -157,14 +157,7 @@ impl HeuristicTests {
 
         let unique_str = self.unique_string(length);
 
-        // To take care of slash when needed
-        let slash = if self.handles.config.add_slash {
-            Some("/")
-        } else {
-            None
-        };
-
-        let nonexistent_url = target.format(&unique_str, slash)?;
+        let nonexistent_url = target.format(&unique_str, None)?;
 
         let response = logged_request(&nonexistent_url.to_owned(), self.handles.clone()).await?;