refactor: change add _ as var is unused in wasm

Author: c-git

src/app.rs

@@ -648,10 +648,10 @@ impl LogViewerApp {
 
             if self.show_last_filename {
                 if let Some(filename) = self.last_filename.lock().unwrap().as_ref() {
-                    let label = ui.label(format!("Filename: {}", filename.display()));
+                    let _label = ui.label(format!("Filename: {}", filename.display()));
                     #[cfg(not(target_arch = "wasm32"))]
                     if let Some(folder) = self.start_open_path.lock().unwrap().as_ref() {
-                        label.on_hover_text(folder.display().to_string());
+                        _label.on_hover_text(folder.display().to_string());
                     }
                 }
             }