[FIX] web: longer delay for module load warning

Warning messages are automatically displayed if a module takes more than 1000ms to load, but this delay is a bit short if you make multiple rpc calls (sorry for all the dead kittens)

addons/web/static/src/js/boot.js

@@ -263,7 +263,7 @@
                     log_when_loaded();
                 }
             });
-        }, 1000);
+        }, 4000);
     };
     $(log_when_loaded);