remove any classes containing "loading" after having processed images

lib/single-file/lazy-loader.js

@@ -87,6 +87,11 @@ this.lazyLoader = this.lazyLoader || (() => {
 	function processElement(element) {
 		element.removeAttribute("data-lazyload");
 		element.classList.remove("b-lazy");
+		element.classList.forEach(className => {
+			if (className.includes("loading")) {
+				element.classList.remove(className);
+			}
+		});
 	}
 
 })();