Follow log_level even when using journald output

fix #3328

CHANGELOG.rst

@@ -10,6 +10,8 @@ Version 7.0
   would ignore our messages entirely.
 - Fix the iq result sent at the end of a MAM response. Some clients (e.g.
   gajim) would throw an error as a result.
+- log_level configuration option is no longer ignored if the logs are written
+  into journald
 
 Sqlite3 to PostgreSQL migration
 -------------------------------

src/logger/logger.hpp

@@ -74,8 +74,8 @@ public:
   bool use_systemd{false};
 #endif
 
-private:
   const int log_level;
+private:
   std::ofstream ofstream{};
   std::ostream stream;
 
@@ -105,6 +105,8 @@ namespace logging_details
     if (Logger::instance()->use_systemd)
       {
         (void)level;
+        if (level >= Logger::instance()->log_level)
+          {
             std::ostringstream os;
             log(os, std::forward<U>(args)...);
             sd_journal_send("MESSAGE=%s", os.str().data(),
@@ -113,6 +115,7 @@ namespace logging_details
                             "CODE_LINE=%i", line,
                             nullptr);
           }
+      }
     else
       {
   #endif