Use 0 as class reader flags in Modlauncher bytecode provider (FabricM…

…C#137)

Relates to neoforged/NeoForge#768

src/modlauncher/java/org/spongepowered/asm/launch/MixinLaunchPluginLegacy.java

@@ -235,7 +235,7 @@ public ClassNode getClassNode(String name, boolean runTransformers) throws Class
  if (classBytes != null && classBytes.length != 0) {
  ClassNode classNode = new ClassNode();
  ClassReader classReader = new MixinClassReader(classBytes, canonicalName);
- classReader.accept(classNode, ClassReader.EXPAND_FRAMES);
+ classReader.accept(classNode, 0);
  return classNode;
  }