Ensure ACC_SUPER is set in InvokeSpecialTransformer

I'm not sure if the transform makes sense if ACC_SUPER is not set. This
is just for sanity checking: the client does use ACC_SUPER in all its
classes.

deob/src/main/java/dev/openrs2/deob/transform/InvokeSpecialTransformer.kt

@@ -16,6 +16,11 @@ class InvokeSpecialTransformer : Transformer() {
         invokeSpecialsReplaced = 0
     }
 
+    override fun transformClass(classPath: ClassPath, library: Library, clazz: ClassNode): Boolean {
+        require(clazz.access and (Opcodes.ACC_SUPER or Opcodes.ACC_INTERFACE) != 0)
+        return false
+    }
+
     override fun transformCode(classPath: ClassPath, library: Library, clazz: ClassNode, method: MethodNode): Boolean {
         for (insn in method.instructions) {
             if (insn !is MethodInsnNode || insn.opcode != Opcodes.INVOKESPECIAL) {