tidy restart workers button handler to lambda

javascript/distributed.js

@@ -1,4 +1,4 @@
 
-function confirm_restart_workers() {
+function confirm_restart_workers(_) {
     return confirm('Restart remote workers?')
 }

scripts/spartan/ui.py

@@ -192,10 +192,6 @@ class UI:
             worker.eta_percent_error = []
         self.world.save_config()
 
-    def restart_workers_btn(self, confirmed: bool):
-        if confirmed:
-            self.world.restart_all()
-
     # end handlers
 
     def create_ui(self):
@@ -253,10 +249,10 @@ class UI:
                         restart_workers_btn = gradio.Button(value="🔁 Restart All", variant='stop')
                         restart_workers_btn.click(
                             _js="confirm_restart_workers",
-                            fn=self.restart_workers_btn, inputs=[restart_workers_btn],
-                            outputs=[restart_workers_btn]
+                            fn=lambda confirmed: self.world.restart_all() if confirmed else None,
+                            inputs=[restart_workers_btn],
+                            outputs=[]
                         )
-
                         components += [refresh_checkpoints_btn, run_usr_btn, reload_config_btn, reconnect_lost_workers_btn, restart_workers_btn]
 
                     with gradio.Row():