Reset docker images correctly when changing egg; closes #2895

public/themes/pterodactyl/js/admin/new-server.js

@@ -83,6 +83,7 @@ $('#pEggId').on('change', function (event) {
     let objectChain = _.get(parentChain, 'eggs.' + $(this).val(), null);
 
     const images = _.get(objectChain, 'docker_images', [])
+    $('#pDefaultContainer').html('');
     for (let i = 0; i < images.length; i++) {
         let opt = document.createElement('option');
         opt.value = images[i];