Disable the even woocommerce_available_variation

Disable woocommerce_available_variation event.

add_action( 'plugins_loaded', function(){
  global $flycart_woo_discount_rules;
  if(!empty($flycart_woo_discount_rules)){
	  remove_filter('woocommerce_available_variation', array($flycart_woo_discount_rules->pricingRules, 'replaceVisiblePricesForVariant'), 100, 3);
  }
});