Fix Load Albums button in the photos widget dialog

The dialog calls /albums via window.FRAME_API, but that's repointed to
this widget's own API base while a dialog is open (see frame_layout.js)
-- /albums is frame-level (lists the owner's whole Immich library, not
scoped to one photo widget), so it needs window.FRAME_BASE_API instead.
The button silently 404'd since the resulting URL never existed.

server/app/static/widget_dialog_photos.js

@@ -73,7 +73,12 @@ async function savePhotoSettings() {
 function initPhotosDialog() {
   document.getElementById('load-albums').addEventListener('click', async () => {
     try {
-      const resp = await fetch(`${window.FRAME_API}/albums`);
+      // /albums is frame-level (routers/api_frames.py) -- it lists the
+      // frame owner's whole Immich library, not something scoped to
+      // this one photo widget -- so it uses window.FRAME_BASE_API (the
+      // stable frame-level base), not window.FRAME_API (repointed to
+      // this widget's own API base while the dialog is open).
+      const resp = await fetch(`${window.FRAME_BASE_API}/albums`);
       if (!resp.ok) {
         throw new Error(await apiError(resp));
       }