Added getOnlineMode() for the Server. Thanks Rigby!

By: EvilSeph <evilseph@unaligned.org>

paper-server/src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -565,4 +565,8 @@ public final class CraftServer implements Server {
         configuration.setProperty("settings.spawn-radius", value);
         configuration.save();
     }
+
+    public boolean getOnlineMode() {
+        return this.console.onlineMode;
+    }
 }