process: fix cpp format issue

Author: Tseian

src/node_process_methods.cc

@@ -168,7 +168,8 @@ static void Cwd(const FunctionCallbackInfo<Value>& args) {
     if (err == UV_ENOENT) {
       // If err == UV_ENOENT it is necessary to notice the user
       // that the current working dir was likely removed.
-      err_msg = err_msg +
+      err_msg =
+          err_msg +
           std::string(", the current working directory was likely removed ") +
           std::string("without changing the working directory");
     }