fix: MOTD not showing up without config.ini

Since we do an early return without a config.ini file, the MOTDSTRING will still be the default std::string value (""), causing the game to output "Gamemaster: ". To fix this, we'll just hardcode the preferred default value for now.

src/settings.cpp

@@ -15,7 +15,7 @@ int settings::SPAWN_X = 179213;
 int settings::SPAWN_Y = 268451;
 int settings::SPAWN_Z = -4210;
 
-std::string settings::MOTDSTRING;
+std::string settings::MOTDSTRING = "Welcome to OpenFusion!";
 
 void settings::init() {
     INIReader reader("config.ini");