fix: relinked files now appear in FilePond UI immediately

Switched from pond.addFile(type:'limbo') to pond.addFiles([{source, options:{type:'local'}}])
in both XamxamRelinkFile and XamxamRelinkPeerTube.

addFile with type 'limbo' doesn't trigger server.load to fetch the file
for the preview/thumbnail. The data-existing-files format (type:'local')
correctly tells FilePond to call server.load for the file identified by
the source (DB ID), rendering it properly in the pool.

app/public/assets/js/app/file-upload-filepond.js

@@ -914,14 +914,17 @@
 					console.log(`[relink] looking for pond | found=${!!pond}`);
 					if (pond) {
 						pond
-							.addFile(String(data.id), {
-								type: "limbo",
-								file: {
-									name: fileName,
-									size: fileSize,
-									type: mimeType,
+							.addFiles([{
+								source: String(data.id),
+								options: {
+									type: "local",
+									file: {
+										name: fileName,
+										size: fileSize,
+										type: mimeType,
+									},
 								},
-							})
+							}])
 							.then(() => {
 								console.log(
 									"[relink] addFile resolved | source=" +
@@ -1021,14 +1024,17 @@
 					var pond = FilePond.find(input);
 					if (pond) {
 						pond
-							.addFile(String(data.id), {
-								type: "limbo",
-								file: {
-									name: name,
-									size: 0,
-									type: "video/mp4",
+							.addFiles([{
+								source: String(data.id),
+								options: {
+									type: "local",
+									file: {
+										name: name,
+										size: 0,
+										type: "video/mp4",
+									},
 								},
-							})
+							}])
 							.then(() => {
 								console.log("[pt-relink] addFile resolved");
 								closeModal();