Fix the dependencies of the Lwt logger

Author: vouillon

lib/lwt/log/jbuild

@@ -4,5 +4,5 @@
   (public_name js_of_ocaml-lwt.logger)
   (synopsis "Lwt logger for js_of_ocaml.")
   (optional)
-  (libraries (js_of_ocaml lwt lwt_log))
+  (libraries (js_of_ocaml lwt lwt_log.core))
   (preprocess (pps (js_of_ocaml-ppx)))))