E_showMenu_Q3: remove scroller as cb func argument

This removes a potential for memory leaks and should otherwise have no
impact. As no app on the main BangleApps repo seems to use the option.
See espruino#2567.

Author: thyttan

libs/js/banglejs/E_showMenu_Q3.js

@@ -137,7 +137,7 @@
       if (idx<0) return back&&back(); // title
       var item = menu[keys[idx]];
       Bangle.buzz(20);
-      if ("function" == typeof item) item(l);
+      if ("function" == typeof item) item();
       else if ("object" == typeof item) {
         // if a bool, just toggle it
         if ("number" == typeof item.value) {