Only initialize NMSUtil#nmsVersionPackage when required (pre 1.17 ser…

…vers)

Fixes support with Paper 1.20.5+ since they decided to not relocate CraftBukkit anymore.
Closes #78

src/main/java/com/viaversion/viarewind/legacysupport/util/NMSUtil.java

@@ -35,7 +35,9 @@ public class NMSUtil {
  private static Field playerConnectionField;
 
  static {
- nmsVersionPackage = Bukkit.getServer().getClass().getPackage().getName().split("\\.")[3];
+ if (BukkitPlugin.getInstance().getServerProtocol().olderThan(ProtocolVersion.v1_17)) {
+ nmsVersionPackage = Bukkit.getServer().getClass().getPackage().getName().split("\\.")[3];
+ }
  }
 
  public static Class<?> getBlockPositionClass() {