Revert the update in tools.cpp

Author: thomaskf

utils/tools.cpp

@@ -5912,7 +5912,7 @@ void parseArg(int argc, char *argv[], Params &params) {
                 err += "\" option.";
                 throw err;
             } else {
-                if (params.user_file == NULL && params.dating_method != "mcmctree")
+                if (params.user_file == NULL)
                     params.user_file = argv[cnt];
                 else
                     params.out_file = argv[cnt];