Settings: create default meters on no existing config file

If htop is started for the first time and no configuration file exists
the header is empty cause no meters are added as a default.

Add the default meters if parsing all available configuration paths
failed.

Settings.c

@@ -543,6 +543,9 @@ Settings* Settings_new(unsigned int initialCpuCount, Hashtable* dynamicColumns)
       this->changed = true;
       Settings_read(this, SYSCONFDIR "/htoprc", initialCpuCount);
    }
+   if (!ok) {
+      Settings_defaultMeters(this, initialCpuCount);
+   }
    return this;
 }