fix(myawesomemenu) wrap callback in anon function

`awful.menu` calls function callback with default arguments from the
menu widget. It's safer to explicitly invoke callbacks without parameter
from an anonymous function.

configuration/menu/myawesomemenu.lua

@@ -14,8 +14,18 @@ local myawesomemenu = {
     },
     { "manual", applications.open_man "awesome" },
     { "edit config", applications.open_editor(capi.awesome.conffile) },
-    { "restart", capi.awesome.restart },
-    { "quit", capi.awesome.quit },
+    {
+        "restart",
+        function()
+            capi.awesome.restart()
+        end,
+    },
+    {
+        "quit",
+        function()
+            capi.awesome.quit()
+        end,
+    },
 }
 
 return myawesomemenu