store-worker: temporarily revert

Of course, after merging some problems come up.
Let's fix those first.

This reverts commit f2f01595a5.

mu/mu-cmd-server.cc

@@ -79,12 +79,11 @@ cookie(size_t n)
 		::printf(COOKIE_PRE "%x" COOKIE_POST, num);
 }
 
+
+
 static void
 output_stdout(const std::string& str, Server::OutputFlags flags)
 {
-	// Note: with the StoreWorker, we _always_ need to flush
-	flags |= Server::OutputFlags::Flush;
-
 	cookie(str.size() + 1);
 	if (G_UNLIKELY(::puts(str.c_str()) < 0)) {
 		mu_critical("failed to write output '{}'", str);