Fix default message loading, because default values are ignored by .getKeys()

core/src/main/java/com/github/games647/fastlogin/core/shared/FastLoginCore.java

@@ -11,6 +11,7 @@ import com.google.common.net.HostAndPort;
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.Reader;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.Proxy;
@@ -103,15 +104,26 @@ public class FastLoginCore<P extends C, C, T extends PlatformPlugin<C>> {
     }
 
     private Configuration loadFile(String fileName) throws IOException {
-        Configuration defaults;
-
         ConfigurationProvider configProvider = ConfigurationProvider.getProvider(YamlConfiguration.class);
+
+        Configuration defaults;
         try (InputStream defaultStream = getClass().getClassLoader().getResourceAsStream(fileName)) {
             defaults = configProvider.load(defaultStream);
         }
 
         Path file = plugin.getPluginFolder().resolve(fileName);
-        return configProvider.load(Files.newBufferedReader(file), defaults);
+
+        Configuration config;
+        try (Reader reader = Files.newBufferedReader(file)) {
+            config = configProvider.load(reader);
+        }
+
+        //explicitly add keys here, because Configuration.getKeys doesn't return the keys from the default configuration
+        for (String key : defaults.getKeys()) {
+            config.set(key, defaults.get(key));
+        }
+
+        return config;
     }
 
     public MojangResolver getResolver() {