edje: fix edje_watch to not pass the '\n' to eio_monitor.

Eina_File line iterator does give the length of the line including the '\n'.
We did previously ignore that and passed the '\n' down to eio_monitor. Obviously
it would fail to monitor a PATH that finished with a '\n' and edje_watch did
stop working. I guess nobody did any real testing with edje watch in the past
year.

@fix

src/bin/edje/edje_watch.c

@@ -53,7 +53,7 @@ read_watch_file(const char *file)
           }
         else
           {
-             path = eina_stringshare_add_length(ln->start, ln->length);
+             path = eina_stringshare_add_length(ln->start, ln->length - 1);
           }
         if (do_append)
 	  r = eina_list_append(r, eio_monitor_add(path));