[CRQ] Better compatibility with Checkout plugin

This is a small code tweak for your consideration. It improves autocomplete compatibility (especially in FF) with a nice checkout page substitute.

\plugins\adresskorrektur-autocomplete-fuer-woo\autocomplete.js:410

/**
 * Better compatibility with Fluid Checkout (FC)
 * Wait for ajax load of payment-methods to finish
 *
**/
window.addEventListener('load', function(){
	// wait obj to exist
	// https://stackoverflow.com/questions/5525071
	var existCondition = setInterval( function() {
		if(!(document.getElementById('shipping_address_1') === null)) {
			clearInterval(existCondition);
			RpCheckoutAutocomplete_shipping.method.initialize();
		}
		if(!(document.getElementById('billing_address_1') === null)) {
			clearInterval(existCondition);
			RpCheckoutAutocomplete.method.initialize();
		}
	}, 2000 ); // ms. Large enough or it doesn't work
});

/*
window.addEventListener('load', function(){
    if(!(document.getElementById('billing_address_1') === null))
        RpCheckoutAutocomplete.method.initialize();
    if(!(document.getElementById('shipping_address_1') === null))
        RpCheckoutAutocomplete_shipping.method.initialize();
});
*/