stop referring to deleted file as background image

www/file/file.less

@@ -24,7 +24,7 @@ body {
 }
 
 #app.ready {
-    background: url('/customize/bg3.jpg') no-repeat center center;
+    //background: url('/customize/bg3.jpg') no-repeat center center;
     background-size: cover;
     background-position: center;
 }