Enabled titlebars

This should have gone in an earlier commit (the one to make focused
windows more obvious) but I missed it.

users/alejandro/sway/sway.nix

@@ -77,12 +77,15 @@ in {
         };
       };
 
-      window.commands = [
+      window = {
+        titlebar = true;
+        commands = [
           {
             command = "inhibit_idle fullscreen";
             criteria = {class = ".*";};
           }
         ];
+      };
 
       focus.followMouse = false;