core: tweak manager_journal_is_running() a bit more

Let's also use the journal if it is currently reloading. In that state
it should also be able to process our requests. Moreover, we might
otherwise end up disconnecting/reconnecting from the journal without
really any need to hence, relax the check accordingly.

src/core/manager.c

@@ -3587,7 +3587,7 @@ static bool manager_journal_is_running(Manager *m) {
         u = manager_get_unit(m, SPECIAL_JOURNALD_SERVICE);
         if (!u)
                 return false;
-        if (SERVICE(u)->state != SERVICE_RUNNING)
+        if (!IN_SET(SERVICE(u)->state, SERVICE_RELOAD, SERVICE_RUNNING))
                 return false;
 
         return true;