Fix detached_cb ctx arg in trans-dvalue example

examples/debug-trans-dvalue/duk_trans_dvalue.c

@@ -1227,9 +1227,11 @@ void duk_trans_dvalue_write_flush_cb(void *udata) {
 	duk__trans_call_cooperate(ctx, 0);
 }
 
-void duk_trans_dvalue_detached_cb(void *udata) {
+void duk_trans_dvalue_detached_cb(duk_context *duk_ctx, void *udata) {
 	duk_trans_dvalue_ctx *ctx = (duk_trans_dvalue_ctx *) udata;
 
+	(void) duk_ctx;
+
 #if defined(DEBUG_PRINTS)
 	fprintf(stderr, "%s: %p\n", __func__, udata);
 	fflush(stderr);